feat(backend): Lagerverwaltung-Modul (Modul 12)

StorageModule mit Lagerbehaeltern, Lagerartikeln und
Bestandsbewegungen (Zugang/Abgang/Umlagerung/Korrektur), die den
Artikelbestand automatisch fortschreiben.

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

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+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 StockItemBody {
+  id: string;
+  quantity: number;
+}
+
+describe('Storage (e2e)', () => {
+  let app: INestApplication<App>;
+  let prisma: PrismaService;
+  const beekeeperEmail = `storage-e2e-beekeeper-${Date.now()}@example.com`;
+  const staffEmail = `storage-e2e-staff-${Date.now()}@example.com`;
+  const password = 'SuperSecret123!';
+  let beekeeperId: string;
+  let staffId: string;
+  let beekeeperToken: string;
+  let staffToken: string;
+  let stockItemId: 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;
+    const staff = await prisma.user.create({
+      data: { email: staffEmail, passwordHash, name: 'Staff', role: 'STAFF' },
+    });
+    staffId = staff.id;
+    beekeeperToken = (await login(app, beekeeperEmail, password)).accessToken;
+    staffToken = (await login(app, staffEmail, password)).accessToken;
+  });
+
+  afterAll(async () => {
+    if (stockItemId) {
+      await prisma.stockMovement.deleteMany({ where: { stockItemId } });
+      await prisma.stockItem.deleteMany({ where: { id: stockItemId } });
+    }
+    await prisma.refreshToken.deleteMany({
+      where: { userId: { in: [beekeeperId, staffId] } },
+    });
+    await prisma.auditLog.deleteMany({
+      where: { userId: { in: [beekeeperId, staffId] } },
+    });
+    await prisma.user.deleteMany({
+      where: { id: { in: [beekeeperId, staffId] } },
+    });
+    await app.close();
+  });
+
+  it('rejects create for a STAFF user', () => {
+    return request(app.getHttpServer())
+      .post('/api/v1/stock-items')
+      .set('Authorization', `Bearer ${staffToken}`)
+      .send({ name: 'Zuckerlösung', category: 'CONSUMABLE', unit: 'l' })
+      .expect(403);
+  });
+
+  it('lets a BEEKEEPER user create a stock item', async () => {
+    const response = await request(app.getHttpServer())
+      .post('/api/v1/stock-items')
+      .set('Authorization', `Bearer ${beekeeperToken}`)
+      .send({
+        name: 'Zuckerlösung',
+        category: 'CONSUMABLE',
+        unit: 'l',
+        quantity: 10,
+      })
+      .expect(201);
+    const stockItem = response.body as StockItemBody;
+    stockItemId = stockItem.id;
+    expect(stockItem.quantity).toBe(10);
+  });
+
+  it('increments quantity on an IN movement', async () => {
+    const response = await request(app.getHttpServer())
+      .post(`/api/v1/stock-items/${stockItemId}/movements`)
+      .set('Authorization', `Bearer ${beekeeperToken}`)
+      .send({ type: 'IN', quantity: 5 })
+      .expect(201);
+    const stockItem = response.body as StockItemBody;
+    expect(stockItem.quantity).toBe(15);
+  });
+
+  it('decrements quantity on an OUT movement', async () => {
+    const response = await request(app.getHttpServer())
+      .post(`/api/v1/stock-items/${stockItemId}/movements`)
+      .set('Authorization', `Bearer ${beekeeperToken}`)
+      .send({ type: 'OUT', quantity: 4 })
+      .expect(201);
+    const stockItem = response.body as StockItemBody;
+    expect(stockItem.quantity).toBe(11);
+  });
+});