feat(backend): Dashboard-Modul (Modul 13)

DashboardModule mit Kennzahlen-Übersicht sowie Alerts fuer
überfällige Aufgaben, auffällige Völker und Lagerartikel unter
Mindestbestand.

ApiCore-Backend/src/dashboard/dashboard.service.spec.ts

@@ -0,0 +1,66 @@
+import { DashboardService } from './dashboard.service';
+import { PrismaService } from '../prisma/prisma.service';
+
+describe('DashboardService', () => {
+  let service: DashboardService;
+  let prisma: {
+    apiary: { count: jest.Mock };
+    colony: { count: jest.Mock; findMany: jest.Mock };
+    queen: { count: jest.Mock };
+    task: { count: jest.Mock; findMany: jest.Mock };
+    honeyBatch: { count: jest.Mock };
+    stockItem: { findMany: jest.Mock };
+  };
+
+  beforeEach(() => {
+    prisma = {
+      apiary: { count: jest.fn().mockResolvedValue(2) },
+      colony: {
+        count: jest.fn().mockResolvedValue(5),
+        findMany: jest.fn().mockResolvedValue([]),
+      },
+      queen: { count: jest.fn().mockResolvedValue(4) },
+      task: {
+        count: jest.fn().mockResolvedValue(3),
+        findMany: jest.fn().mockResolvedValue([]),
+      },
+      honeyBatch: { count: jest.fn().mockResolvedValue(1) },
+      stockItem: { findMany: jest.fn().mockResolvedValue([]) },
+    };
+    service = new DashboardService(prisma as unknown as PrismaService);
+  });
+
+  it('summary counts low-stock items below their minimum threshold', async () => {
+    prisma.stockItem.findMany.mockResolvedValue([
+      { id: 'item-1', quantity: 2, minThreshold: 5 },
+      { id: 'item-2', quantity: 10, minThreshold: 5 },
+    ]);
+
+    const summary = await service.summary();
+
+    expect(summary.stockItemsLowCount).toBe(1);
+    expect(summary.apiariesActive).toBe(2);
+    expect(summary.coloniesActive).toBe(5);
+  });
+
+  it('alerts flags overdue tasks, attention colonies, and low stock', async () => {
+    prisma.task.findMany.mockResolvedValue([
+      { id: 'task-1', title: 'Beute prüfen' },
+    ]);
+    prisma.colony.findMany.mockResolvedValue([
+      { id: 'colony-1', code: 'V-001', status: 'WEAK' },
+    ]);
+    prisma.stockItem.findMany.mockResolvedValue([
+      { id: 'item-1', name: 'Zuckerlösung', quantity: 2, minThreshold: 5 },
+    ]);
+
+    const alerts = await service.alerts();
+
+    expect(alerts).toHaveLength(3);
+    expect(alerts.map((alert) => alert.type)).toEqual([
+      'OVERDUE_TASK',
+      'COLONY_ATTENTION',
+      'LOW_STOCK',
+    ]);
+  });
+});