[Rename] Unify Die → Dice naming across the entire project

Standardize all class, interface, file, method, event, field, and variable
names from the inconsistent "Die" form to "Dice", matching the existing
DiceManager/DiceCatalog/DiceCollection convention.

Renamed files (7 + meta): IDie→IDice, DieInstance→DiceInstance,
DieDefinitionSO→DiceDefinitionSO, StandardDieSO→StandardDiceSO,
DieValueCondition→DiceValueCondition, AddPerDieEffect→AddPerDiceEffect,
MultiplyPerDieEffect→MultiplyPerDiceEffect.

Updated all 31 consumer and test files with matching reference changes.

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

Assets/Scripts/Dice/DiceRoller.cs

@@ -16,7 +16,7 @@ namespace YachtDice.Dice
         [SerializeField] private Rigidbody rb;
 
         /// <summary>Определение типа дайса (назначается в инспекторе).</summary>
-        [field: SerializeField] public DieDefinitionSO Definition { get; private set; }
+        [field: SerializeField] public DiceDefinitionSO Definition { get; private set; }
 
         [Header("Throw Settings")]
         [Tooltip("Сила подброса вверх")]