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/common/campus-scope.middleware.ts

@@ -1,13 +0,0 @@
-import { Injectable, NestMiddleware } from '@nestjs/common';
-import { Request, Response, NextFunction } from 'express';
-import { CampusScope, CampusRequest } from './campus-scope';
-
-@Injectable()
-export class CampusScopeMiddleware implements NestMiddleware {
-  constructor(private readonly scope: CampusScope) {}
-
-  use(req: Request, _res: Response, next: NextFunction): void {
-    (req as CampusRequest).campusScope = this.scope;
-    next();
-  }
-}

apps/server/src/common/campus-scope.ts

@@ -1,77 +0,0 @@
-import { Injectable, Scope, Inject } from '@nestjs/common';
-import { REQUEST } from '@nestjs/core';
-import { In } from 'typeorm';
-import { Request } from 'express';
-import { DepartmentsService } from '../departments/departments.service';
-
-export interface CampusRequest extends Request {
-  user?: {
-    id: number;
-    isSuperAdmin?: boolean;
-  };
-  campusScope?: CampusScope;
-}
-
-@Injectable({ scope: Scope.REQUEST })
-export class CampusScope {
-  constructor(
-    @Inject(REQUEST) private req: CampusRequest,
-    private departmentsService: DepartmentsService,
-  ) {}
-
-  get userId(): number | undefined {
-    return this.req.user?.id;
-  }
-
-  get isSuperAdmin(): boolean {
-    return this.req.user?.isSuperAdmin ?? false;
-  }
-
-  get currentDepartmentId(): number | null {
-    const raw = this.req.headers?.['x-campus-id'];
-    if (raw === undefined) return null;
-    const str = Array.isArray(raw) ? raw[0] : raw;
-    if (!str) return null;
-    const id = parseInt(str, 10);
-    return Number.isNaN(id) ? null : id;
-  }
-
-  /** Appends departmentId filter. No campus selected = no filtering for super admin; empty result for others. */
-  async filter<T extends Record<string, unknown>>(where: T): Promise<T> {
-    if (this.isSuperAdmin && !this.currentDepartmentId) {
-      return where;
-    }
-
-    const ids = await this.getEffectiveScopeIds();
-    if (ids.length === 0) {
-      // Non-super-admin with no scoping → match nothing, never leak unfiltered data
-      if (!this.isSuperAdmin) {
-        return { ...where, departmentId: In([]) };
-      }
-      return where;
-    }
-
-    return { ...where, departmentId: In(ids) };
-  }
-
-  /** Returns department IDs for QueryBuilder .andWhere(). null = no filtering. */
-  async getScopeDepartmentIds(): Promise<number[] | null> {
-    if (this.isSuperAdmin && !this.currentDepartmentId) return null;
-    const ids = await this.getEffectiveScopeIds();
-    return ids.length > 0 ? ids : null;
-  }
-
-  private async getEffectiveScopeIds(): Promise<number[]> {
-    if (this.currentDepartmentId) {
-      return this.departmentsService.getDescendantIds(this.currentDepartmentId);
-    }
-
-    if (!this.userId) return [];
-
-    const userDeptIds = await this.departmentsService.getUserDepartments(this.userId);
-    const allIds = await Promise.all(
-      userDeptIds.map((id) => this.departmentsService.getDescendantIds(id)),
-    );
-    return [...new Set(allIds.flat())];
-  }
-}

apps/server/src/common/common.module.ts

@@ -1,11 +1,4 @@
 import { Module } from '@nestjs/common';
-import { CampusScope } from './campus-scope';
-import { CampusScopeMiddleware } from './campus-scope.middleware';
-import { DepartmentsModule } from '../departments/departments.module';
 
-@Module({
-  imports: [DepartmentsModule],
-  providers: [CampusScope, CampusScopeMiddleware],
-  exports: [CampusScope, CampusScopeMiddleware, DepartmentsModule],
-})
+@Module({})
 export class CommonModule {}