unit test fixes + error refactor

src/routes/admin.system.routes.test.ts

@@ -76,7 +76,7 @@ describe('Admin System Routes (/api/admin/system)', () => {
       vi.mocked(clearGeocodeCache).mockRejectedValue(new Error('Redis is down'));
       const response = await supertest(app).post('/api/admin/system/clear-geocode-cache');
       expect(response.status).toBe(500);
-      expect(response.body.message).toBe('Redis is down');
+      expect(response.body.message).toContain('Redis is down');
     });
   });
 });