Refactor namespaces to follow new naming convention and add item model classes

Models/Pet.cs

@@ -1,6 +1,7 @@
 using System.ComponentModel.DataAnnotations;
+using Pet.Companion.Models.Enums;
 
-namespace pet_companion_api.Models
+namespace Pet.Companion.Models
 {
     public class Pet
     {
@@ -10,7 +11,11 @@ namespace pet_companion_api.Models
         public PetClass Class { get; set; }
         public PetStats Stats { get; set; }
         public Resources Resources { get; set; }
+        public Inventory Inventory { get; set; }
         public int Level { get; set; }
+        public int Experience { get; set; }
+        public int Health { get; set; }
+        public int MaxHealth { get; set; }
         public string UserId { get; set; }
         public bool IsDead { get; set; }
 
@@ -20,6 +25,16 @@ namespace pet_companion_api.Models
         public PetBasicAction PetBasicAction { get; set; }
         public DateTime BasicActionCooldown { get; set; }
 
+        public Dictionary<EquipmentSlot, EquipableItem> Equipment { get; set; } = new();
+
+        public Pet()
+        {
+            foreach (EquipmentSlot slot in Enum.GetValues(typeof(EquipmentSlot)))
+            {
+                Equipment[slot] = null;
+            }
+        }
+
         public void IncrementIntelligence(int amount)
         {
             var newValue = Stats.Intelligence + amount;