[Refactor] Replace [SerializeField] + getter with [field: SerializeField] auto-properties

Convert serialized private fields with public arrow getters to
[field: SerializeField] auto-properties across ScriptableObjects
(DieDefinitionSO, CategoryDefinition, ModifierDefinition, Effect,
ModifierBehavior, SumOfValueCategory) and select MonoBehaviours
(DiceRoller, Dice.Entry struct). Fields with type-changing getters
(List→IReadOnlyList) or computed getters are intentionally kept as-is.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Assets/Scripts/Dice/DieDefinitionSO.cs

@@ -9,20 +9,15 @@ namespace YachtDice.Dice
     /// </summary>
     public abstract class DieDefinitionSO : ScriptableObject, IShopItem
     {
-        [Header("Identity")]
-        [SerializeField] private string id;
-        [SerializeField] private string displayName;
-        [SerializeField, TextArea] private string description;
-        [SerializeField] private Sprite icon;
+        [field: Header("Identity")]
+        [field: SerializeField] public string Id { get; private set; }
+        [field: SerializeField] public string DisplayName { get; private set; }
+        [field: SerializeField, TextArea] public string Description { get; private set; }
+        [field: SerializeField] public Sprite Icon { get; private set; }
 
-        [Header("Economy")]
-        [SerializeField] private int shopPrice;
+        [field: Header("Economy")]
+        [field: SerializeField] public int ShopPrice { get; private set; }
 
-        public string Id => id;
-        public string DisplayName => displayName;
-        public string Description => description;
-        public Sprite Icon => icon;
-        public int ShopPrice => shopPrice;
         public bool IsRepurchasable => false;
 
         /// <summary>Количество граней.</summary>
@@ -36,10 +31,10 @@ namespace YachtDice.Dice
             int shopPrice = 0, string description = null) where T : DieDefinitionSO
         {
             var so = CreateInstance<T>();
-            so.id = id;
-            so.displayName = displayName ?? id;
-            so.description = description ?? id;
-            so.shopPrice = shopPrice;
+            so.Id = id;
+            so.DisplayName = displayName ?? id;
+            so.Description = description ?? id;
+            so.ShopPrice = shopPrice;
             return so;
         }
 #endif