feat: auto-populate department_id on create + seed default campus with backfill

apps/server/src/schedules/dto/schedule.dto.ts

@@ -60,6 +60,10 @@ export class CreateScheduleDto {
   @IsOptional()
   @IsString()
   notes?: string;
+
+  @IsOptional()
+  @IsInt()
+  departmentId?: number;
 }
 
 export class UpdateScheduleDto {

apps/server/src/schedules/schedules.service.ts

@@ -1,7 +1,7 @@
 import { Injectable, NotFoundException, ConflictException } from '@nestjs/common';
 import { InjectRepository } from '@nestjs/typeorm';
 import { Repository } from 'typeorm';
-import { ClassSchedule } from '../entities';
+import { ClassSchedule, Class } from '../entities';
 import { CampusScope } from '../common/campus-scope';
 import {
   CreateScheduleDto,
@@ -16,6 +16,7 @@ export class SchedulesService {
     @InjectRepository(ClassSchedule)
     private readonly scheduleRepo: Repository<ClassSchedule>,
     private readonly scope: CampusScope,
+    @InjectRepository(Class) private readonly classRepo: Repository<Class>,
   ) {}
 
   async findAll(query: QueryScheduleDto) {
@@ -47,6 +48,12 @@ export class SchedulesService {
     await this.checkConflict(dto.classroomId, dto.weekDay, dto.startTime, dto.endTime, dto.startDate, dto.endDate);
 
     const schedule = this.scheduleRepo.create(dto);
+    if (dto.departmentId) {
+      schedule.departmentId = dto.departmentId;
+    } else if (dto.classId) {
+      const cls = await this.classRepo.findOne({ where: { id: dto.classId } });
+      if (cls) schedule.departmentId = cls.departmentId;
+    }
     const saved = await this.scheduleRepo.save(schedule);
     return this.findOne(saved.id);
   }