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/attendance/attendance.service.ts

@@ -43,10 +43,6 @@ export class AttendanceService {
       throw new BadRequestException('records array must not be empty');
     }
 
-    // Batch-load student departmentIds
-    const ids = [...new Set(dto.records.map((r) => r.studentId))];
-    const students = await this.studentRepo.find({ where: { id: In(ids) } });
-    const deptMap = new Map(students.map((s) => [s.id, s.departmentId]));
 
     const entities = dto.records.map((r) => {
       const entity = this.attendanceRepo.create({
@@ -58,7 +54,6 @@ export class AttendanceService {
         remark: r.remark,
         source: r.source || 'manual',
       });
-      entity.departmentId = deptMap.get(r.studentId)!;
       return entity;
     });
 
@@ -128,7 +123,6 @@ export class AttendanceService {
             status: 'pending',
             source: 'schedule',
           });
-          entity.departmentId = cs.student?.departmentId ?? undefined;
           entities.push(entity);
           existingKeys.add(key);
         }