Rework shop to support multiple item types and add unified PlayerModel

Generalize the shop from selling only ModifierDefinition to any IShopItem
(modifiers + dice). Add purchase condition checks, hover tooltips, and
fixed prices. Introduce PlayerModel as a facade over CurrencyBank,
InventoryModel, and DiceCollection for centralized state and save/load.

New files:
- IShopItem interface for purchasable items
- ShopCatalog SO (unified catalog for all item types)
- ShopTooltipView (description on hover)
- PlayerModel (aggregates player state)
- DiceCollection (owned dice tracking)
- DiceCatalog SO (dice definition registry)
- DiceCollectionTests

Modified:
- ModifierDefinition/DieDefinitionSO implement IShopItem
- ShopModel/ShopView/ShopItemView/ShopController use IShopItem
- SaveData v3 with OwnedDiceIds
- GameController uses PlayerModel for save/load
- GameLifetimeScope registers new services

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

Assets/Scripts/DI/GameLifetimeScope.cs

@@ -2,6 +2,7 @@ using UnityEngine;
 using VContainer;
 using VContainer.Unity;
 using YachtDice.Categories;
+using YachtDice.Dice;
 using YachtDice.Economy;
 using YachtDice.Events;
 using YachtDice.Game;
@@ -9,6 +10,7 @@ using YachtDice.Inventory;
 using YachtDice.Modifiers.Definition;
 using YachtDice.Modifiers.Pipeline;
 using YachtDice.Modifiers.Runtime;
+using YachtDice.Player;
 using YachtDice.Scoring;
 using YachtDice.Shop;
 using YachtDice.UI;
@@ -19,6 +21,8 @@ namespace YachtDice.DI
     {
         [SerializeField] private ModifierCatalog modifierCatalog;
         [SerializeField] private CategoryCatalog categoryCatalog;
+        [SerializeField] private DiceCatalog diceCatalog;
+        [SerializeField] private ShopCatalog shopCatalog;
 
         [Header("Scene References")]
         [SerializeField] private ScoringSystem scoringSystem;
@@ -37,6 +41,8 @@ namespace YachtDice.DI
             // SO catalogs
             builder.RegisterInstance(modifierCatalog);
             builder.RegisterInstance(categoryCatalog);
+            builder.RegisterInstance(diceCatalog);
+            builder.RegisterInstance(shopCatalog);
 
             // Core modifier services
             builder.Register<ModifierRegistry>(Lifetime.Singleton)
@@ -44,8 +50,14 @@ namespace YachtDice.DI
             builder.Register<ModifierPipeline>(Lifetime.Singleton);
             builder.Register<GameEventBus>(Lifetime.Singleton);
 
-            // Domain models
+            // Player subsystems
+            builder.Register<DiceCollection>(Lifetime.Singleton);
             builder.Register<InventoryModel>(Lifetime.Singleton);
+
+            // Unified player model
+            builder.Register<PlayerModel>(Lifetime.Singleton);
+
+            // Shop
             builder.Register<ShopModel>(Lifetime.Singleton);
 
             // Scene MonoBehaviour components