feat: add Student-User association and activate all notification TODOs

apps/server/src/deposits/deposits.controller.ts

@@ -10,6 +10,9 @@ import {
   UseGuards,
   Request,
 } from '@nestjs/common';
+import { InjectRepository } from '@nestjs/typeorm';
+import { Repository } from 'typeorm';
+import { Student } from '../entities/student.entity';
 import { DepositsService } from './deposits.service';
 import { NotificationsService } from '../notifications/notifications.service';
 import { NotificationType } from '../entities/notification.entity';
@@ -26,6 +29,7 @@ export class DepositsController {
     private service: DepositsService,
     private logService: OperationLogsService,
     private readonly notificationsService: NotificationsService,
+    @InjectRepository(Student) private studentRepo: Repository<Student>,
   ) {}
 
   @Get()
@@ -71,7 +75,18 @@ export class DepositsController {
       ipAddress,
       userAgent,
     });
-    // TODO: Send notification for deposit_due — studentId→userId mapping unavailable
+    // Send deposit_due notification
+    try {
+      const student = await this.studentRepo.findOne({ where: { id: dto.studentId } });
+      if (student?.userId) {
+        void this.notificationsService.create({
+          recipientIds: [student.userId],
+          type: 'deposit_due',
+          title: '押金待缴',
+          content: `您有一笔押金待缴纳,金额: ¥${dto.amount}`,
+        });
+      }
+    } catch (_) { /* don't block response */ }
     return result;
   }
 
@@ -115,7 +130,18 @@ export class DepositsController {
       ipAddress,
       userAgent,
     });
-    // TODO: Send notification for deposit_refunded — studentId→userId mapping unavailable
+    // Send deposit_refunded notification
+    try {
+      const student = await this.studentRepo.findOne({ where: { id: result.studentId } });
+      if (student?.userId) {
+        void this.notificationsService.create({
+          recipientIds: [student.userId],
+          type: 'deposit_refunded',
+          title: '押金已退还',
+          content: `您的押金已退还,退还¥${result.refundAmount},扣除¥${result.deductionAmount}`,
+        });
+      }
+    } catch (_) { /* don't block response */ }
     return result;
   }