refactor(server): remove Department/UserDepartment entities, CampusScope, and departmentId from all entities

- Delete department.entity.ts, user-department.entity.ts
- Remove Department/UserDepartment from entities/index.ts
- Remove departmentId column from 18 entities (AttendanceRecord, ArchiveAttachment, Bill, ClassSchedule, Classroom, ClassroomRental, Deposit, DepositInstallment, ExamScore, LearningRecord, Occupancy, PersonalExpense, ResultArchive, Room, RoomExpense, Student, StudentEnrollment, StudentProfile, StudentReport)
- Remove departments/ module entirely
- Delete campus-scope.ts, campus-scope.middleware.ts (request-utils.ts kept — it's just IP extraction)
- Simplify common.module.ts to empty module
- Remove CampusScopeMiddleware from app.module.ts
- Remove all CampusScope injections and filter calls across all services
- Remove departmentId from all DTOs and controllers
- Simplify dingtalk/wecom sync to only sync users (no dept table)
- Update seed module to remove department seeding
- Clean frontend compilation

apps/server/src/students/dto/student.dto.ts

@@ -44,8 +44,6 @@ export class CreateStudentDto {
   @IsString()
   supervisor?: string;
   @IsOptional()
-  @IsInt()
-  departmentId?: number;
 
   @IsOptional()
   @IsInt()

apps/server/src/students/students.controller.ts

@@ -290,8 +290,7 @@ export class StudentsController {
         }
       }
     }
-    const departmentId = req.headers?.['x-campus-id'] ? parseInt(String(req.headers['x-campus-id']), 10) || undefined : undefined;
-    const result = await this.service.batchImport(rows, departmentId);
+    const result = await this.service.batchImport(rows);
     await this.logService.log({
       userId: req.user?.id,
       username: req.user?.username,

apps/server/src/students/students.service.ts

@@ -39,11 +39,7 @@ export class StudentsService {
   }
 
   async create(dto: CreateStudentDto) {
-    const entity = this.repo.create(dto);
-    if (dto.departmentId) {
-      entity.departmentId = dto.departmentId;
-    }
-    return this.repo.save(entity);
+    return this.repo.save(this.repo.create(dto));
   }
 
   async update(id: number, dto: UpdateStudentDto) {
@@ -57,7 +53,6 @@ export class StudentsService {
     if (student.status === 'archived') {
       throw new BadRequestException('该学生已归档');
     }
-    // 软删除：归档而非物理删除，保留历史数据
     await this.repo.update(id, { status: 'archived' });
     return { message: '已归档（数据已保留，可随时恢复）' };
   }
@@ -110,7 +105,6 @@ export class StudentsService {
       supervisor?: string;
       tenantId?: number;
     }[],
-    departmentId?: number,
   ) {
     let imported = 0;
     let skipped = 0;
@@ -136,7 +130,6 @@ export class StudentsService {
           organization: row.organization || undefined,
           supervisor: row.supervisor || undefined,
           tenantId: row.tenantId || undefined,
-          departmentId: departmentId ?? undefined,
         }),
       );
       imported++;
@@ -152,7 +145,6 @@ export class StudentsService {
     const student = await this.repo.findOne({ where: { id: studentId } });
     if (!student) throw new NotFoundException('学生不存在');
 
-    // Get all class enrollments for this student
     const enrollments = await this.classStudentRepo.find({
       where: { studentId },
       relations: ['class'],
@@ -162,13 +154,11 @@ export class StudentsService {
       return { student, enrollments: [] };
     }
 
-    // For each enrollment, compute attendance stats
     const classIds = enrollments.map((e) => e.classId);
     const attendanceRecords = await this.attendanceRepo.find({
       where: { studentId, classId: In(classIds) },
     });
 
-    // Group attendance by class
     const attendanceByClass = new Map<number, AttendanceRecord[]>();
     for (const r of attendanceRecords) {
       const list = attendanceByClass.get(r.classId) || [];