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/seed/seed.module.ts

@@ -6,13 +6,13 @@ import {
   Bill, BillItem, User, Deposit,
   Classroom, Tenant, ClassroomRental, Permission, Role,
   Class, ClassStudent, ClassTeacher, ClassSchedule,
-  AttendanceRecord, Department, UserDepartment,
+  AttendanceRecord,
   StudentProfile, StudentEnrollment, ExamScore, LearningRecord,
   ExpenseType,
 } from '../entities';
 
 const SEED_ENTITIES = [
-  Department, User, Role, Permission, UserDepartment,
+  User, Role, Permission,
   Tenant, Student, Room, Classroom, Occupancy,
   RoomExpense, ExpenseType, Class,
   ClassStudent, ClassTeacher, ClassSchedule, Bill, BillItem,