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/InventoryController.cs

@@ -1,16 +1,14 @@
 using Microsoft.AspNetCore.Mvc;
-using PetCompanion.Models;
 using PetCompanion.Services;
 
 namespace PetCompanion.Controllers
 {
     [ApiController]
     [Route("api/v1/[controller]")]
-    public class InventoryController : ControllerBase
+    public class InventoryController : BaseController
     {
         private readonly PetInventoryService inventoryService;
         private readonly ILogger<InventoryController> logger;
-        private readonly Guid userId = Guid.Parse("f5f4b3b3-3b7b-4b7b-8b7b-7b7b7b7b7b7b");
 
         public InventoryController(
             ILogger<InventoryController> logger,