feat(backend): Benachrichtigungssystem (Modul 26)

NotificationsModule: Notification-Modell mit Prioritaeten INFO/
HINWEIS/WARNUNG/KRITISCH, GET /notifications (eigene + Broadcast),
POST /notifications/:id/read. record() als interne API fuer
kuenftige Automatisierungsregeln (Modul 30) vorgesehen.

ApiCore-Backend/test/notifications.e2e-spec.ts

@@ -0,0 +1,81 @@
+import { INestApplication } from '@nestjs/common';
+import * as bcrypt from 'bcryptjs';
+import request from 'supertest';
+import { App } from 'supertest/types';
+import { PrismaService } from '../src/prisma/prisma.service';
+import { createTestApp } from './utils/create-test-app';
+import { login } from './utils/api';
+
+interface NotificationBody {
+  id: string;
+  priority: string;
+  read: boolean;
+}
+
+describe('Notifications (e2e)', () => {
+  let app: INestApplication<App>;
+  let prisma: PrismaService;
+  const beekeeperEmail = `notifications-e2e-beekeeper-${Date.now()}@example.com`;
+  const password = 'SuperSecret123!';
+  let beekeeperId: string;
+  let beekeeperToken: string;
+  let notificationId: string;
+
+  beforeAll(async () => {
+    app = await createTestApp();
+    prisma = app.get(PrismaService);
+
+    const passwordHash = await bcrypt.hash(password, 12);
+    const beekeeper = await prisma.user.create({
+      data: {
+        email: beekeeperEmail,
+        passwordHash,
+        name: 'Beekeeper',
+        role: 'BEEKEEPER',
+      },
+    });
+    beekeeperId = beekeeper.id;
+    beekeeperToken = (await login(app, beekeeperEmail, password)).accessToken;
+
+    const notification = await prisma.notification.create({
+      data: {
+        userId: beekeeperId,
+        priority: 'KRITISCH',
+        message: `Kritischer Testalarm ${Date.now()}`,
+      },
+    });
+    notificationId = notification.id;
+  });
+
+  afterAll(async () => {
+    await prisma.notification.deleteMany({ where: { id: notificationId } });
+    await prisma.refreshToken.deleteMany({ where: { userId: beekeeperId } });
+    await prisma.auditLog.deleteMany({ where: { userId: beekeeperId } });
+    await prisma.user.deleteMany({ where: { id: beekeeperId } });
+    await app.close();
+  });
+
+  it('lists notifications for the authenticated user', async () => {
+    const response = await request(app.getHttpServer())
+      .get('/api/v1/notifications')
+      .set('Authorization', `Bearer ${beekeeperToken}`)
+      .expect(200);
+    const notifications = response.body as NotificationBody[];
+    expect(
+      notifications.some(
+        (notification) =>
+          notification.id === notificationId &&
+          notification.priority === 'KRITISCH',
+      ),
+    ).toBe(true);
+  });
+
+  it('marks a notification as read', async () => {
+    const response = await request(app.getHttpServer())
+      .post(`/api/v1/notifications/${notificationId}/read`)
+      .set('Authorization', `Bearer ${beekeeperToken}`)
+      .expect(201);
+    const notification = response.body as NotificationBody;
+    expect(notification.read).toBe(true);
+  });
+});