apps/admin/src/components/StudentProfileContent/index.tsx

@@ -321,7 +321,11 @@ const EnrollmentsTab: React.FC<TabProps & { data: EnrollmentRecord[] }> = ({
         columns={columns}
         dataSource={data}
         rowKey="id"
-        pagination={{ pageSize: 15 }}
+        pagination={{
+          defaultPageSize: 15,
+          showSizeChanger: true,
+          pageSizeOptions: [15, 30, 50],
+        }}
       />
       <Modal
         title="添加报读记录"
@@ -428,7 +432,11 @@ const ExamScoresTab: React.FC<TabProps & { data: ExamScoreRecord[]; enrollments:
         columns={columns}
         dataSource={data}
         rowKey="id"
-        pagination={{ pageSize: 15 }}
+        pagination={{
+          defaultPageSize: 15,
+          showSizeChanger: true,
+          pageSizeOptions: [15, 30, 50],
+        }}
       />
       <Modal
         title="添加考试成绩"
@@ -529,7 +537,11 @@ const LearningTab: React.FC<TabProps & { data: LearningRecord[] }> = ({ data, st
         columns={columns}
         dataSource={data}
         rowKey="id"
-        pagination={{ pageSize: 15 }}
+        pagination={{
+          defaultPageSize: 15,
+          showSizeChanger: true,
+          pageSizeOptions: [15, 30, 50],
+        }}
       />
       <Modal
         title="添加学情记录"
@@ -712,7 +724,11 @@ const AttachmentsTab: React.FC<TabProps & { data: AttachmentRecord[] }> = ({ dat
         columns={columns}
         dataSource={data}
         rowKey="id"
-        pagination={{ pageSize: 15 }}
+        pagination={{
+          defaultPageSize: 15,
+          showSizeChanger: true,
+          pageSizeOptions: [15, 30, 50],
+        }}
         style={{ marginTop: 16 }}
       />
     </div>

apps/admin/src/pages/Bills/index.tsx

@@ -399,7 +399,12 @@ const BillsPage: React.FC = () => {
         dataSource={filteredBills}
         rowKey="id"
         loading={loading}
-        pagination={{ pageSize: 15, showTotal: (total) => `共 ${total} 条` }}
+        pagination={{
+          defaultPageSize: 15,
+          showSizeChanger: true,
+          pageSizeOptions: [15, 30, 50, 100],
+          showTotal: (total) => `共 ${total} 条`,
+        }}
         locale={{ emptyText: <Empty description="暂无数据" /> }}
         rowSelection={{
           selectedRowKeys: selectedRows,

apps/admin/src/pages/Classes/detail.tsx

@@ -530,7 +530,11 @@ const ClassDetailPage: React.FC = () => {
                   columns={studentColumns}
                   dataSource={students}
                   rowKey="id"
-                  pagination={{ pageSize: 20 }}
+                  pagination={{
+                    defaultPageSize: 20,
+                    showSizeChanger: true,
+                    pageSizeOptions: [20, 50, 100],
+                  }}
                 />
                 <Modal
                   title="添加学员"
@@ -574,7 +578,11 @@ const ClassDetailPage: React.FC = () => {
                   columns={teacherColumns}
                   dataSource={teachers}
                   rowKey="id"
-                  pagination={{ pageSize: 20 }}
+                  pagination={{
+                    defaultPageSize: 20,
+                    showSizeChanger: true,
+                    pageSizeOptions: [20, 50, 100],
+                  }}
                 />
                 <Modal
                   title="添加教师"
@@ -633,7 +641,11 @@ const ClassDetailPage: React.FC = () => {
                   columns={scheduleColumns}
                   dataSource={schedules}
                   rowKey="id"
-                  pagination={{ pageSize: 20 }}
+                  pagination={{
+                    defaultPageSize: 20,
+                    showSizeChanger: true,
+                    pageSizeOptions: [20, 50, 100],
+                  }}
                 />
               </div>
             ),

apps/admin/src/pages/Classes/index.tsx

@@ -264,7 +264,11 @@ const ClassesPage: React.FC = () => {
         rowKey="id"
         loading={loading}
         locale={{ emptyText: <Empty description="暂无数据" /> }}
-        pagination={{ pageSize: 20 }}
+        pagination={{
+          defaultPageSize: 20,
+          showSizeChanger: true,
+          pageSizeOptions: [20, 50, 100],
+        }}
         scroll={{ x: 1100 }}
       />
 

apps/admin/src/pages/ClassroomRentals/index.tsx

@@ -483,7 +483,12 @@ const ClassroomRentalsPage: React.FC = () => {
         rowKey="id"
         loading={loading}
         locale={{ emptyText: <Empty description="暂无数据" /> }}
-        pagination={{ pageSize: 15, showTotal: (total) => `共 ${total} 条` }}
+        pagination={{
+          defaultPageSize: 15,
+          showSizeChanger: true,
+          pageSizeOptions: [15, 30, 50, 100],
+          showTotal: (total) => `共 ${total} 条`,
+        }}
         scroll={{ x: 1200 }}
       />
       <Modal

apps/admin/src/pages/Classrooms/index.tsx

@@ -287,7 +287,12 @@ const ClassroomsPage: React.FC = () => {
         rowKey="id"
         loading={loading}
         locale={{ emptyText: <Empty description="暂无数据" /> }}
-        pagination={{ pageSize: 20, showTotal: (total) => `共 ${total} 条` }}
+        pagination={{
+          defaultPageSize: 20,
+          showSizeChanger: true,
+          pageSizeOptions: [20, 50, 100],
+          showTotal: (total) => `共 ${total} 条`,
+        }}
       />
       <Modal
         title={editing ? '编辑教室' : '添加教室'}

apps/admin/src/pages/Deposits/deposit-student-option.integration.test.ts

@@ -1,5 +1,5 @@
 import { describe, expect, it } from 'vitest';
-import { buildDepositStudentOption } from './deposit-student-option';
+import { buildDepositStudentOption, buildDepositStudentOptions } from './deposit-student-option';
 
 describe('deposit student option', () => {
   it('uses the student number as the non-sensitive identifier', () => {
@@ -17,4 +17,13 @@ describe('deposit student option', () => {
       label: '张三 (#23)',
     });
   });
+
+  it('uses lookup rows without requiring a status field', () => {
+    expect(buildDepositStudentOptions([{ id: 23, name: '张三', studentNo: 'S2026001' }])).toEqual([
+      {
+        value: 23,
+        label: '张三 (S2026001)',
+      },
+    ]);
+  });
 });

apps/admin/src/pages/Deposits/deposit-student-option.ts

@@ -8,3 +8,6 @@ export const buildDepositStudentOption = (student: DepositStudentLookup) => ({
   value: student.id,
   label: `${student.name} (${student.studentNo || `#${student.id}`})`,
 });
+
+export const buildDepositStudentOptions = (students: DepositStudentLookup[]) =>
+  students.map(buildDepositStudentOption);

apps/admin/src/pages/Deposits/index.tsx

@@ -19,7 +19,7 @@ import dayjs from 'dayjs';
 import api from '../../api';
 import PermissionButton from '../../components/PermissionButton';
 import { message } from '../../ui/app-message';
-import { buildDepositStudentOption } from './deposit-student-option';
+import { buildDepositStudentOptions } from './deposit-student-option';
 
 const statusMap: Record<string, { text: string; color: string }> = {
   paid: { text: '已缴', color: 'green' },
@@ -33,6 +33,10 @@ const installmentStatusMap: Record<string, { text: string; color: string }> = {
   paid: { text: '已缴', color: 'green' },
 };
 
+const isFormValidationError = (error: unknown) =>
+  typeof error === 'object'
+  && error !== null
+  && Array.isArray((error as { errorFields?: unknown }).errorFields);
 
 const DepositsPage: React.FC = () => {
   const [data, setData] = useState<any[]>([]);
@@ -82,17 +86,14 @@ const DepositsPage: React.FC = () => {
   }, [data, searchText, filterStatus]);
 
   const studentOptions = useMemo(
-    () =>
+    () => buildDepositStudentOptions(students),
-      students
-        .filter((s: any) => s.status === 'active')
-        .map(buildDepositStudentOption),
     [students],
   );
 
   const handleCreate = async () => {
     setSaving(true);
-    const values = await createForm.validateFields();
     try {
+      const values = await createForm.validateFields();
       await api.post('/deposits', {
         studentId: values.studentId,
         amount: values.amount,
@@ -104,7 +105,9 @@ const DepositsPage: React.FC = () => {
       createForm.resetFields();
       fetchData();
     } catch (e: any) {
+      if (!isFormValidationError(e)) {
         message.error(e?.message || '操作失败');
+      }
     } finally {
       setSaving(false);
     }
@@ -112,8 +115,8 @@ const DepositsPage: React.FC = () => {
 
   const handleRefund = async () => {
     setSaving(true);
-    const values = await refundForm.validateFields();
     try {
+      const values = await refundForm.validateFields();
       await api.put(`/deposits/${refundModal.id}/refund`, {
         refundDate: values.refundDate.format('YYYY-MM-DD'),
         deductionAmount: values.deductionAmount || 0,
@@ -125,7 +128,9 @@ const DepositsPage: React.FC = () => {
       refundForm.resetFields();
       fetchData();
     } catch (e: any) {
+      if (!isFormValidationError(e)) {
         message.error(e?.message || '操作失败');
+      }
     } finally {
       setSaving(false);
     }
@@ -133,8 +138,8 @@ const DepositsPage: React.FC = () => {
 
   const handleAddInstallment = async () => {
     if (installmentModal == null) return;
-    const values = await installmentForm.validateFields();
     try {
+      const values = await installmentForm.validateFields();
       await api.post(`/deposits/${installmentModal}/installments`, {
         amount: values.amount,
         dueDate: values.dueDate.format('YYYY-MM-DD'),
@@ -144,8 +149,10 @@ const DepositsPage: React.FC = () => {
       installmentForm.resetFields();
       fetchData();
     } catch (e: any) {
+      if (!isFormValidationError(e)) {
         message.error(e?.message || '操作失败');
       }
+    }
   };
 
   const handlePayInstallment = async (installmentId: number) => {
@@ -304,7 +311,12 @@ const DepositsPage: React.FC = () => {
     rowKey="id"
     loading={loading}
     scroll={{ x: 1200 }}
-    pagination={{ pageSize: 15, showTotal: (total) => `共 ${total} 条` }}
+    pagination={{
+      defaultPageSize: 15,
+      showSizeChanger: true,
+      pageSizeOptions: [15, 30, 50, 100],
+      showTotal: (total) => `共 ${total} 条`,
+    }}
     locale={{ emptyText: <Empty description="暂无数据" /> }}
   />
 

apps/admin/src/pages/Expenses/index.tsx

@@ -452,7 +452,12 @@ const ExpensesPage: React.FC = () => {
                   rowKey="id"
                   loading={loading}
                   scroll={{ x: 1200 }}
-                  pagination={{ pageSize: 15, showTotal: (total) => `共 ${total} 条` }}
+                  pagination={{
+                    defaultPageSize: 15,
+                    showSizeChanger: true,
+                    pageSizeOptions: [15, 30, 50, 100],
+                    showTotal: (total) => `共 ${total} 条`,
+                  }}
                   locale={{ emptyText: <Empty description="暂无数据" /> }}
                   rowSelection={{
                     selectedRowKeys: selectedRoomKeys,
@@ -575,7 +580,12 @@ const ExpensesPage: React.FC = () => {
                   rowKey="id"
                   loading={loading}
                   scroll={{ x: 1200 }}
-                  pagination={{ pageSize: 15, showTotal: (total) => `共 ${total} 条` }}
+                  pagination={{
+                    defaultPageSize: 15,
+                    showSizeChanger: true,
+                    pageSizeOptions: [15, 30, 50, 100],
+                    showTotal: (total) => `共 ${total} 条`,
+                  }}
                   locale={{ emptyText: <Empty description="暂无数据" /> }}
                   rowSelection={{
                     selectedRowKeys: selectedPersonalKeys,

apps/admin/src/pages/Occupancies/index.tsx

@@ -522,7 +522,12 @@ const OccupanciesPage: React.FC = () => {
         loading={loading}
         locale={{ emptyText: <Empty description="暂无数据" /> }}
         scroll={{ x: 1300 }}
-        pagination={{ pageSize: 15, showTotal: (total) => `共 ${total} 条` }}
+        pagination={{
+          defaultPageSize: 15,
+          showSizeChanger: true,
+          pageSizeOptions: [15, 30, 50, 100],
+          showTotal: (total) => `共 ${total} 条`,
+        }}
         rowSelection={rowSelection}
       />
       <Modal

apps/admin/src/pages/OperationLogs/index.tsx

@@ -26,13 +26,14 @@ const OperationLogsPage: React.FC = () => {
   const [total, setTotal] = useState(0);
   const [loading, setLoading] = useState(false);
   const [page, setPage] = useState(1);
+  const [pageSize, setPageSize] = useState(20);
   const [filterModule, setFilterModule] = useState<string | undefined>();
   const [dateRange, setDateRange] = useState<[string, string] | null>(null);
 
   const fetchData = useCallback(async () => {
     setLoading(true);
     try {
-      const params: any = { page, pageSize: 20 };
+      const params: any = { page, pageSize };
       if (filterModule) params.module = filterModule;
       if (dateRange) {
         params.startDate = dateRange[0];
@@ -46,7 +47,7 @@ const OperationLogsPage: React.FC = () => {
       message.error(err?.message || '加载失败，请稍后重试');
     }
     setLoading(false);
-  }, [page, filterModule, dateRange]);
+  }, [page, pageSize, filterModule, dateRange]);
 
   useEffect(() => {
     fetchData();
@@ -159,8 +160,13 @@ const OperationLogsPage: React.FC = () => {
         pagination={{
           current: page,
           total,
-          pageSize: 20,
+          pageSize,
-          onChange: setPage,
+          showSizeChanger: true,
+          pageSizeOptions: [20, 50, 100],
+          onChange: (nextPage, nextPageSize) => {
+            setPage(nextPage);
+            setPageSize(nextPageSize);
+          },
           showTotal: (t) => `共 ${t} 条`,
         }}
       />

apps/admin/src/pages/Organizations/index.tsx

@@ -235,7 +235,12 @@ const OrganizationsPage: React.FC = () => {
         loading={loading}
         locale={{ emptyText: <Empty description="暂无机构" /> }}
         scroll={{ x: 1100 }}
-        pagination={{ pageSize: 20, showTotal: (total) => `共 ${total} 个机构` }}
+        pagination={{
+          defaultPageSize: 20,
+          showSizeChanger: true,
+          pageSizeOptions: [20, 50, 100],
+          showTotal: (total) => `共 ${total} 个机构`,
+        }}
       />
       <Modal
         title={editing ? `编辑机构 · ${editing.name}` : '添加外部机构'}

apps/admin/src/pages/Rooms/index.tsx

@@ -156,6 +156,11 @@ const RoomsPage: React.FC = () => {
     if (filterStatus) result = result.filter((r: Record<string, unknown>) => r.status === filterStatus);
     return result;
   }, [data, searchText, filterBuilding, filterStatus]);
+  const remainingBedSlots = useMemo(() => {
+    const capacity = Number(drawerRoom?.capacity) || 0;
+    return Math.max(capacity - beds.length, 0);
+  }, [drawerRoom?.capacity, beds.length]);
+  const defaultBatchBedCount = Math.min(4, Math.max(remainingBedSlots, 1));
 
   const handleSave = async () => {
     const values = await form.validateFields();
@@ -167,7 +172,7 @@ const RoomsPage: React.FC = () => {
         message.success('更新成功');
       } else {
         await api.post('/rooms', payload);
-        message.success('创建成功');
+        message.success(`创建成功，已自动生成 ${values.capacity} 张床位`);
       }
       setModalOpen(false);
       form.resetFields();
@@ -514,7 +519,12 @@ const RoomsPage: React.FC = () => {
         scroll={{ x: 1200 }}
         loading={loading}
         locale={{ emptyText: <Empty description="暂无数据" /> }}
-        pagination={{ pageSize: 20, showTotal: (total) => `共 ${total} 间` }}
+        pagination={{
+          defaultPageSize: 20,
+          showSizeChanger: true,
+          pageSizeOptions: [20, 50, 100],
+          showTotal: (total) => `共 ${total} 间`,
+        }}
         rowClassName={(record) => (record.status === 'archived' ? 'archived-row' : '')}
         rowSelection={{
           selectedRowKeys,
@@ -629,24 +639,26 @@ const RoomsPage: React.FC = () => {
                       type="primary"
                       size="small"
                       icon={<PlusOutlined />}
-                      disabled={drawerRoom?.status === 'archived'}
+                      disabled={drawerRoom?.status === 'archived' || remainingBedSlots === 0}
                       onClick={() => { setBedEditing(null); bedForm.resetFields(); setBedModalOpen(true); }}
                     >
                       添加床位
                     </Button>
                     <Popconfirm
-                      title="批量生成床位"
+                      title={remainingBedSlots > 0 ? '批量生成床位' : '床位已达到额定人数'}
                       description={
-                        <InputNumber min={1} max={20} defaultValue={4} id="batch-bed-count" style={{ width: 80 }} />
+                        remainingBedSlots > 0
+                          ? <InputNumber min={1} max={remainingBedSlots} defaultValue={defaultBatchBedCount} id="batch-bed-count" style={{ width: 80 }} />
+                          : '如需增加床位，请先调整宿舍额定人数'
                       }
                       onConfirm={() => {
                         const input = document.getElementById('batch-bed-count') as HTMLInputElement;
-                        handleBatchBeds(input ? parseInt(input.value) || 4 : 4);
+                        handleBatchBeds(input ? parseInt(input.value) || defaultBatchBedCount : defaultBatchBedCount);
                       }}
                       okText="生成"
-                      disabled={drawerRoom?.status === 'archived'}
+                      disabled={drawerRoom?.status === 'archived' || remainingBedSlots === 0}
                     >
-                      <Button size="small" disabled={drawerRoom?.status === 'archived'}>批量生成</Button>
+                      <Button size="small" disabled={drawerRoom?.status === 'archived' || remainingBedSlots === 0}>批量生成</Button>
                     </Popconfirm>
                   </div>
                   <Table

apps/admin/src/pages/Students/index.tsx

@@ -577,7 +577,12 @@ const StudentsPage: React.FC = () => {
         loading={loading}
         locale={{ emptyText: <Empty description="暂无数据" /> }}
         scroll={{ x: 1410 }}
-        pagination={{ pageSize: 15, showTotal: (total) => `共 ${total} 人` }}
+        pagination={{
+          defaultPageSize: 15,
+          showSizeChanger: true,
+          pageSizeOptions: [15, 30, 50, 100],
+          showTotal: (total) => `共 ${total} 人`,
+        }}
         rowClassName={(record: any) => (record.status === 'archived' ? 'archived-row' : '')}
         rowSelection={{
           selectedRowKeys,

apps/admin/src/pages/TeacherWorkspace/index.tsx

@@ -146,7 +146,12 @@ const TeacherWorkspacePage: React.FC = () => {
                 columns={classColumns}
                 dataSource={data.assignedClasses}
                 rowKey="classId"
-                pagination={{ pageSize: 20, showTotal: (total) => `共 ${total} 个班级` }}
+                pagination={{
+                  defaultPageSize: 20,
+                  showSizeChanger: true,
+                  pageSizeOptions: [20, 50, 100],
+                  showTotal: (total) => `共 ${total} 个班级`,
+                }}
               />
             ) : (
               <Empty description="暂无分配的班级" />
@@ -160,7 +165,12 @@ const TeacherWorkspacePage: React.FC = () => {
                 columns={scheduleColumns}
                 dataSource={data.todaySchedules}
                 rowKey="id"
-                pagination={{ pageSize: 20, showTotal: (total) => `共 ${total} 节` }}
+                pagination={{
+                  defaultPageSize: 20,
+                  showSizeChanger: true,
+                  pageSizeOptions: [20, 50, 100],
+                  showTotal: (total) => `共 ${total} 节`,
+                }}
               />
             ) : (
               <Empty description="今日无排课" />
@@ -174,7 +184,12 @@ const TeacherWorkspacePage: React.FC = () => {
                 columns={studentColumns}
                 dataSource={data.myStudents}
                 rowKey="studentId"
-                pagination={{ pageSize: 20, showTotal: (total) => `共 ${total} 人` }}
+                pagination={{
+                  defaultPageSize: 20,
+                  showSizeChanger: true,
+                  pageSizeOptions: [20, 50, 100],
+                  showTotal: (total) => `共 ${total} 人`,
+                }}
               />
             ) : (
               <Empty description="暂无学生" />

apps/admin/src/pages/Teachers/index.tsx

@@ -46,13 +46,14 @@ const ROLE_TYPE_LABELS: Record<string, string> = {
   academic_teacher: '教务老师',
 };
 
-const PAGE_SIZE = 20;
+const DEFAULT_PAGE_SIZE = 20;
 
 const TeachersPage: React.FC = () => {
   const [data, setData] = useState<TeacherRow[]>([]);
   const [loading, setLoading] = useState(false);
   const [total, setTotal] = useState(0);
   const [page, setPage] = useState(1);
+  const [pageSize, setPageSize] = useState(DEFAULT_PAGE_SIZE);
   const [search, setSearch] = useState('');
   const [profileModal, setProfileModal] = useState<TeacherRow | null>(null);
   const [form] = Form.useForm<ProfileFormValues>();
@@ -62,7 +63,7 @@ const TeachersPage: React.FC = () => {
     setLoading(true);
     try {
       const res = await api.get<TeacherListResponse>('/rbac/teachers', {
-        params: { search: search || undefined, page, pageSize: PAGE_SIZE },
+        params: { search: search || undefined, page, pageSize },
       });
       setData(res.list);
       setTotal(res.total);
@@ -70,7 +71,7 @@ const TeachersPage: React.FC = () => {
       // silent
     }
     setLoading(false);
-  }, [page, search]);
+  }, [page, pageSize, search]);
 
   useEffect(() => {
     fetchData();
@@ -199,9 +200,14 @@ const TeachersPage: React.FC = () => {
         scroll={{ x: 1300 }}
         pagination={{
           current: page,
-          pageSize: PAGE_SIZE,
+          pageSize,
           total,
-          onChange: setPage,
+          showSizeChanger: true,
+          pageSizeOptions: [20, 50, 100],
+          onChange: (nextPage, nextPageSize) => {
+            setPage(nextPage);
+            setPageSize(nextPageSize);
+          },
           showTotal: (t) => `共 ${t} 人`,
         }}
         expandable={{

apps/server/src/bills/bills-export.service.ts

@@ -5,7 +5,7 @@ import { Bill } from '../entities/bill.entity';
 import { BillItem } from '../entities/bill-item.entity';
 import { Deposit } from '../entities/deposit.entity';
 import * as ExcelJS from 'exceljs';
-import * as PDFDocument from 'pdfkit';
+import PDFDocument from 'pdfkit';
 import { Response } from 'express';
 
 @Injectable()

apps/server/src/rooms/rooms.service.ts

@@ -110,7 +110,9 @@ export class RoomsService {
       roomType: dto.roomType ?? parsed.roomType,
       capacity: dto.capacity ?? parsed.capacity,
     });
-    return this.repo.save(entity);
+    const room = await this.repo.save(entity);
+    await this.createDefaultBeds(room.id, room.capacity);
+    return room;
   }
 
   async update(id: number, dto: UpdateRoomDto) {
@@ -312,7 +314,7 @@ export class RoomsService {
       }
       // 智能解析房间号
       const parsed = RoomsService.parseRoomNumber(row.roomNumber.trim());
-      await this.repo.save(
+      const room = await this.repo.save(
         this.repo.create({
           roomNumber: row.roomNumber.trim(),
           building: row.building?.trim() || parsed.building || undefined,
@@ -323,6 +325,7 @@ export class RoomsService {
           monthlyRate: row.monthlyRate ?? undefined,
         }),
       );
+      await this.createDefaultBeds(room.id, room.capacity);
       imported++;
     }
     return {
@@ -353,6 +356,7 @@ export class RoomsService {
     const room = await this.repo.findOne({ where: { id: roomId } });
     if (!room) throw new NotFoundException('宿舍不存在');
     if (room.status === 'archived') throw new BadRequestException('已归档宿舍不能添加床位');
+    await this.assertCanAddBeds(room, 1);
     const existing = await this.bedRepo.findOne({ where: { roomId, bedNumber: dto.bedNumber } });
     if (existing) throw new BadRequestException('该床位编号已存在');
     const bed = this.bedRepo.create({ ...dto, roomId });
@@ -387,6 +391,7 @@ export class RoomsService {
     if (!room) throw new NotFoundException('宿舍不存在');
     if (room.status === 'archived') throw new BadRequestException('已归档宿舍不能添加床位');
     const existing = await this.bedRepo.find({ where: { roomId }, order: { bedNumber: 'ASC' } });
+    this.assertCanAddBedsFromCount(room, existing.length, dto.count);
     const numbers = existing.map((b) => {
       const match = b.bedNumber.match(/^\d+/);
       return match ? parseInt(match[0]) : 0;
@@ -399,6 +404,27 @@ export class RoomsService {
     return this.bedRepo.save(beds);
   }
 
+  private async createDefaultBeds(roomId: number, capacity: number): Promise<void> {
+    const count = Math.max(capacity ?? 0, 0);
+    if (count === 0) return;
+    const beds = Array.from({ length: count }, (_, index) =>
+      this.bedRepo.create({ roomId, bedNumber: `${index + 1}号床` }),
+    );
+    await this.bedRepo.save(beds);
+  }
+
+  private async assertCanAddBeds(room: Room, count: number): Promise<void> {
+    const existingCount = await this.bedRepo.count({ where: { roomId: room.id } });
+    this.assertCanAddBedsFromCount(room, existingCount, count);
+  }
+
+  private assertCanAddBedsFromCount(room: Room, existingCount: number, count: number): void {
+    const remaining = Math.max((room.capacity ?? 0) - existingCount, 0);
+    if (count > remaining) {
+      throw new BadRequestException(`床位不能超过额定人数，当前已有 ${existingCount} 张，额定 ${room.capacity} 张，最多还能添加 ${remaining} 张`);
+    }
+  }
+
   // ── 柜子管理 ──
 
   async getRoomLockers(roomId: number): Promise<Locker[]> {