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/schedules/schedules.service.spec.ts

@@ -6,7 +6,6 @@ import { SchedulesService } from './schedules.service';
 import { ClassSchedule, ScheduleType } from '../entities/class-schedule.entity';
 import { ClassroomRental } from '../entities/classroom-rental.entity';
 import { Class } from '../entities/class.entity';
-import { CampusScope } from '../common/campus-scope';
 
 /** Build a mock query-builder where each chain method returns `this`. */
 function mockQueryBuilder<T>(results: T[] = []) {
@@ -36,7 +35,6 @@ describe('SchedulesService — checkConflict', () => {
         { provide: getRepositoryToken(ClassSchedule), useValue: mockRepo },
         { provide: getRepositoryToken(Class), useValue: { find: jest.fn().mockResolvedValue([]) } },
         { provide: getRepositoryToken(ClassroomRental), useValue: { createQueryBuilder: jest.fn() } },
-        { provide: CampusScope, useValue: { getScopeDepartmentIds: jest.fn().mockResolvedValue(null), filter: jest.fn((w: unknown) => w) } },
       ],
     }).compile();
 
@@ -138,13 +136,6 @@ describe('SchedulesService — getClassroomOccupancy', () => {
         { provide: getRepositoryToken(ClassSchedule), useValue: { createQueryBuilder: jest.fn() } },
         { provide: getRepositoryToken(Class), useValue: { find: jest.fn().mockResolvedValue([]) } },
         { provide: getRepositoryToken(ClassroomRental), useValue: { createQueryBuilder: jest.fn() } },
-        {
-          provide: CampusScope,
-          useValue: {
-            getScopeDepartmentIds: jest.fn().mockResolvedValue(null),
-            filter: jest.fn((w: unknown) => w),
-          },
-        },
       ],
     }).compile();