feat: Implement a new Inventory Service API, add admin budget and frequency controllers to Ads Serving, and introduce product and category controllers to Catalog Service.

services/inventory-service-net/src/InventoryService.API/Program.cs

@@ -74,6 +74,9 @@ try
             Version = "v1",
             Description = "InventoryService microservice API / API microservice InventoryService"
         });
+        
+        // EN: Enable annotations / VI: Bật annotations
+        options.EnableAnnotations();
     });
 
     // EN: Add health checks / VI: Thêm health checks