feat: warn on the dashboard when a queen is 3+ years old

Queen.hatchYear was already captured but never used anywhere - no
signal existed for "this colony's queen is overdue for evaluation or
replacement," despite that being one of the most common productivity
and swarming risk factors in beekeeping. Adds an OLD_QUEEN dashboard
alert alongside the existing overdue-task/swarm-check ones, flagging
any active colony whose current queen has completed 3+ seasons.

Co-Authored-By: Claude Sonnet 5 <[email protected]>

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

@@ -107,4 +107,35 @@ describe('DashboardService', () => {
 
     expect(alerts).toHaveLength(0);
   });
+
+  describe('OLD_QUEEN', () => {
+    it('flags a colony whose queen is at least 3 years old', async () => {
+      prisma.colony.findMany
+        .mockResolvedValueOnce([]) // attentionColonies
+        .mockResolvedValueOnce([
+          { id: 'colony-1', code: 'V-001', currentQueen: { hatchYear: 2020 } },
+        ]);
+
+      const alerts = await service.alerts();
+
+      expect(alerts).toHaveLength(1);
+      expect(alerts[0].type).toBe('OLD_QUEEN');
+      expect(alerts[0].relatedId).toBe('colony-1');
+    });
+
+    it('does not flag a queen younger than the threshold', async () => {
+      const currentYear = new Date().getFullYear();
+      prisma.colony.findMany.mockResolvedValueOnce([]).mockResolvedValueOnce([
+        {
+          id: 'colony-1',
+          code: 'V-001',
+          currentQueen: { hatchYear: currentYear },
+        },
+      ]);
+
+      const alerts = await service.alerts();
+
+      expect(alerts).toHaveLength(0);
+    });
+  });
 });