Implement base controller for shared functionality; update existing controllers to inherit from BaseController and adjust user ID handling. Add JWT authentication support and modify item retrieval methods in GameDataController.

Controllers/PetController.cs

@@ -4,14 +4,11 @@ using PetCompanion.Services;
 
 namespace PetCompanion.Controllers
 {
-    [ApiController]
-    [Route("api/v1/[controller]")]
-    public class PetController : ControllerBase
+    public class PetController : BaseController
     {
         private readonly PetService petService;
         private readonly PetClassService petClassService;
         private readonly ILogger<PetController> logger;
-        private Guid userId = Guid.Parse("f5f4b3b3-3b7b-4b7b-8b7b-7b7b7b7b7b7b");
 
         public PetController(
             ILogger<PetController> logger,