feat: Excel 导入预检与动态问答，AI 聊天/文件解析体验修复

- imports: 新增 preflight_import 预检报告（判定/分阶段统计/阻断归因/问题/下一步/错误示例），导入任务 settings 落库（映射/校区/更新/重复/未匹配策略），预览应用策略，向导提交写操作日志
- ai-chat: 新增 excel_analyze（ExcelJS）工具，移除附件/上下文截断，start_import_wizard 支持确认参数，ui.import_preflight SSE，预览确认写操作日志
- admin: ImportPreflightCard 渲染与持久化，聊天抽屉布局/侧边栏修复，考勤页 CSS 引入，费用/学生页接口 schema 校验修复

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

@@ -4,6 +4,7 @@ import { useUserStore } from '../../store/user/userStore';
 import { getAttendanceExperience } from './attendance-workspace';
 import { TeacherAttendanceWorkspace } from './teacher';
 import { AdminAttendanceArchive } from './admin';
+import './attendance.css';
 
 function readCurrentRoles(): string[] {
   const roles = useUserStore.getState().user?.roles;

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

@@ -9,7 +9,12 @@ import { message } from '../../ui/app-message';
 import { usePermission } from '../../hooks/usePermission';
 import { useApiMutation } from '../../hooks/useApiMutation';
 import { validateResponse } from '../../utils/validate';
-import { expenseLookupsSchema, expenseRecordsSchema } from '../../api/schemas';
+import {
+  expenseLookupsSchema,
+  expenseRecordsSchema,
+  expenseRoomsListSchema,
+  expenseStudentLookupsSchema,
+} from '../../api/schemas';
 import { archiveViewPolicy, expenseStatusForView } from '../archive-view';
 import { ExpenseTablePanel } from './ExpenseTablePanel';
 import { PersonalExpenseModal, RoomExpenseModal, UtilityModal } from './ExpenseModals';
@@ -70,10 +75,10 @@ const ExpensesPage: React.FC = () => {
       try {
         const [rooms, personal, students, roomsList] = await Promise.all([
           api.get('/expenses/room', {
-            params: expenseStatusForView(showArchived ? 'archived' : 'active'),
+            params: { status: expenseStatusForView(showArchived ? 'archived' : 'active') },
           }),
           api.get('/expenses/personal', {
-            params: expenseStatusForView(showArchived ? 'archived' : 'active'),
+            params: { status: expenseStatusForView(showArchived ? 'archived' : 'active') },
           }),
           api.get('/expenses/student-lookups'),
           api.get('/rooms'),
@@ -81,8 +86,8 @@ const ExpensesPage: React.FC = () => {
         return {
           rooms: validateResponse(expenseRecordsSchema, rooms),
           personal: validateResponse(expenseRecordsSchema, personal),
-          students: validateResponse(expenseRecordsSchema, students),
-          roomsList: validateResponse(expenseRecordsSchema, roomsList),
+          students: validateResponse(expenseStudentLookupsSchema, students),
+          roomsList: validateResponse(expenseRoomsListSchema, roomsList),
         };
       } catch {
         message.error('加载费用数据失败');