feat: Wiederkehrende Aufgaben-Vorlagen (recurring task templates)

Neue TaskTemplate-Entität mit YEARLY/MONTHLY/INTERVAL_DAYS-Wiederholung.
Fällige Aufgaben werden lazy bei GET /tasks erzeugt (Compare-and-Swap auf
nextDueDate), damit mehrere API-Replicas im Kubernetes-Cluster dieselbe
Vorlage nicht doppelt feuern - ohne zusätzliche Cron-Abhängigkeit.

Frontend: Verwaltungsseite unter /settings/task-templates zum Anlegen,
Auflisten und Deaktivieren von Vorlagen.

ApiCore-Backend/test/task-templates.e2e-spec.ts

@@ -0,0 +1,106 @@
+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 TaskTemplateBody {
+  id: string;
+  nextDueDate: string;
+  active: boolean;
+}
+
+describe('TaskTemplates (e2e)', () => {
+  let app: INestApplication<App>;
+  let prisma: PrismaService;
+  const beekeeperEmail = `task-templates-e2e-beekeeper-${Date.now()}@example.com`;
+  const password = 'SuperSecret123!';
+  let beekeeperId: string;
+  let beekeeperToken: string;
+  let templateId: 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;
+  });
+
+  afterAll(async () => {
+    if (templateId) {
+      await prisma.task.deleteMany({ where: { sourceTemplateId: templateId } });
+      await prisma.taskTemplate.delete({ where: { id: templateId } });
+    }
+    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('rejects a YEARLY template missing recurrenceMonth/recurrenceDayOfMonth', () => {
+    return request(app.getHttpServer())
+      .post('/api/v1/task-templates')
+      .set('Authorization', `Bearer ${beekeeperToken}`)
+      .send({ title: 'Jahresinventur', recurrenceType: 'YEARLY' })
+      .expect(400);
+  });
+
+  it('creates an INTERVAL_DAYS template and computes nextDueDate', async () => {
+    const response = await request(app.getHttpServer())
+      .post('/api/v1/task-templates')
+      .set('Authorization', `Bearer ${beekeeperToken}`)
+      .send({
+        title: `Fütterung ${Date.now()}`,
+        recurrenceType: 'INTERVAL_DAYS',
+        intervalDays: 1,
+      })
+      .expect(201);
+    const body = response.body as TaskTemplateBody;
+    templateId = body.id;
+    expect(body.nextDueDate).toEqual(expect.any(String));
+  });
+
+  it('generates a due Task lazily on GET /tasks and advances nextDueDate', async () => {
+    const yesterday = new Date();
+    yesterday.setUTCDate(yesterday.getUTCDate() - 1);
+    await prisma.taskTemplate.update({
+      where: { id: templateId },
+      data: { nextDueDate: yesterday },
+    });
+
+    await request(app.getHttpServer())
+      .get('/api/v1/tasks')
+      .set('Authorization', `Bearer ${beekeeperToken}`)
+      .expect(200);
+
+    const generatedTask = await prisma.task.findFirst({
+      where: { sourceTemplateId: templateId },
+    });
+    expect(generatedTask).not.toBeNull();
+
+    const template = await prisma.taskTemplate.findUniqueOrThrow({
+      where: { id: templateId },
+    });
+    expect(template.nextDueDate.getTime()).toBeGreaterThan(yesterday.getTime());
+  });
+
+  it('deactivates a template', async () => {
+    const response = await request(app.getHttpServer())
+      .post(`/api/v1/task-templates/${templateId}/deactivate`)
+      .set('Authorization', `Bearer ${beekeeperToken}`)
+      .expect(201);
+    expect((response.body as TaskTemplateBody).active).toBe(false);
+  });
+});