[Add] Universal modifier system, shop, inventory & persistence

Replace hardcoded BonusForOnes/MultiplierForSixes with data-driven
modifier system supporting 2 scopes (SelectedCategory, AnyCategoryClosed),
4 effect types, durability modes (Permanent, LimitedUses), and
configurable targets via ScriptableObject (ModifierData).

- Modifier domain: ModifierEnums, ModifierTarget, ModifierData,
  ModifierRuntime, ModifierEffect (dict-based strategy), ModifierPipeline
  (4-pass: cat-additive → cat-multiplicative → final-additive → final-multiplicative)
- ScoringSystem: replaced old modifier list with ModifierPipeline integration,
  added OnCategoryConfirmed event
- Shop MVC: ShopCatalog (SO), ShopModel, ShopView, ShopItemView, ShopController
- Inventory MVC: InventoryModel (activate/deactivate/sell/durability),
  InventoryView, InventorySlotView, InventoryController
- CurrencyBank: editor-adjustable balance with events
- Persistence: SaveData + SaveSystem (Newtonsoft JSON + PlayerPrefs)
- Editor: ModifierAssetCreator menu item to generate 6 example modifiers + catalog
- Tests: 6 test classes covering effects, pipeline, scoring, shop, inventory, save
- GameController: wired shop/inventory/save lifecycle
- GameInfoView: added currency display, shop/inventory toggle buttons

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

Assets/Scripts/UI/GameController.cs

@@ -14,8 +14,14 @@ public sealed class GameController : MonoBehaviour
     [SerializeField] private DicePanelView dicePanelView;
     [SerializeField] private GameInfoView gameInfoView;
 
+    [Header("Economy & Modifiers")]
+    [SerializeField] private CurrencyBank currencyBank;
+    [SerializeField] private ShopController shopController;
+    [SerializeField] private InventoryController inventoryController;
+
     [Header("Settings")]
     [SerializeField] private int maxRollsPerTurn = 3;
+    [SerializeField] private int maxActiveModifierSlots = 5;
 
     private static readonly YachtCategory[] UpperCategories =
     {
@@ -28,6 +34,9 @@ public sealed class GameController : MonoBehaviour
 
     private int totalCategoryCount;
 
+    private InventoryModel inventoryModel;
+    private ShopModel shopModel;
+
     // ── Lifecycle ──────────────────────────────────────────────
 
     private void Awake()
@@ -46,6 +55,14 @@ public sealed class GameController : MonoBehaviour
         dicePanelView.OnRollClicked += HandleRollClicked;
         dicePanelView.OnDiceToggled += HandleDiceToggled;
         gameInfoView.OnNewGameClicked += HandleNewGameClicked;
+        gameInfoView.OnShopClicked += HandleShopClicked;
+        gameInfoView.OnInventoryClicked += HandleInventoryClicked;
+
+        // Currency
+        if (currencyBank != null)
+            currencyBank.OnBalanceChanged += HandleCurrencyChanged;
+
+        InitializeModifierSystems();
     }
 
     private void OnDestroy()
@@ -60,6 +77,100 @@ public sealed class GameController : MonoBehaviour
         dicePanelView.OnRollClicked -= HandleRollClicked;
         dicePanelView.OnDiceToggled -= HandleDiceToggled;
         gameInfoView.OnNewGameClicked -= HandleNewGameClicked;
+        gameInfoView.OnShopClicked -= HandleShopClicked;
+        gameInfoView.OnInventoryClicked -= HandleInventoryClicked;
+
+        if (currencyBank != null)
+            currencyBank.OnBalanceChanged -= HandleCurrencyChanged;
+
+        if (inventoryModel != null)
+            inventoryModel.OnInventoryChanged -= HandleInventoryChangedForSave;
+    }
+
+    // ── Modifier System Init ─────────────────────────────────
+
+    private void InitializeModifierSystems()
+    {
+        inventoryModel = new InventoryModel(maxActiveModifierSlots);
+        inventoryModel.OnInventoryChanged += HandleInventoryChangedForSave;
+
+        ShopCatalog catalog = shopController != null ? shopController.Catalog : null;
+
+        shopModel = new ShopModel(currencyBank, inventoryModel);
+
+        LoadSaveData(catalog);
+
+        if (inventoryController != null)
+            inventoryController.Initialize(inventoryModel);
+
+        if (shopController != null)
+            shopController.Initialize(shopModel);
+
+        if (currencyBank != null)
+            gameInfoView.SetCurrencyText(currencyBank.Balance);
+    }
+
+    private void LoadSaveData(ShopCatalog catalog)
+    {
+        SaveData save = SaveSystem.Load();
+
+        if (currencyBank != null && save.Currency > 0)
+            currencyBank.SetBalance(save.Currency);
+
+        if (catalog != null && save.OwnedModifiers.Count > 0)
+        {
+            var runtimeList = new List<ModifierRuntime>();
+            var permanentIds = new HashSet<string>();
+
+            for (int i = 0; i < save.OwnedModifiers.Count; i++)
+            {
+                var entry = save.OwnedModifiers[i];
+                ModifierData data = catalog.FindById(entry.ModifierId);
+
+                if (data == null)
+                {
+                    Debug.LogWarning($"Modifier '{entry.ModifierId}' not found in catalog, skipping.");
+                    continue;
+                }
+
+                var runtime = new ModifierRuntime
+                {
+                    ModifierId = entry.ModifierId,
+                    IsActive = entry.IsActive,
+                    RemainingUses = entry.RemainingUses,
+                    Data = data
+                };
+
+                runtimeList.Add(runtime);
+
+                if (data.Durability == ModifierDurability.Permanent)
+                    permanentIds.Add(data.Id);
+            }
+
+            inventoryModel.LoadState(runtimeList);
+            shopModel.LoadPurchasedPermanentIds(permanentIds);
+        }
+    }
+
+    private void PerformSave()
+    {
+        var save = new SaveData
+        {
+            Currency = currencyBank != null ? currencyBank.Balance : 0
+        };
+
+        var owned = inventoryModel.GetAllForSave();
+        for (int i = 0; i < owned.Count; i++)
+        {
+            save.OwnedModifiers.Add(new ModifierSaveEntry
+            {
+                ModifierId = owned[i].ModifierId,
+                IsActive = owned[i].IsActive,
+                RemainingUses = owned[i].RemainingUses
+            });
+        }
+
+        SaveSystem.Save(save);
     }
 
     // ── Model Event Handlers ──────────────────────────────────
@@ -93,6 +204,7 @@ public sealed class GameController : MonoBehaviour
     {
         scoreCardView.SetCategoryScored(category, finalScore);
         UpdateTotalDisplay();
+        PerformSave();
     }
 
     private void HandleGameOver(int totalScore)
@@ -103,6 +215,7 @@ public sealed class GameController : MonoBehaviour
 
         int displayTotal = CalculateDisplayTotal();
         gameInfoView.ShowGameOver(displayTotal);
+        PerformSave();
     }
 
     // ── View Event Handlers ───────────────────────────────────
@@ -145,6 +258,43 @@ public sealed class GameController : MonoBehaviour
         gameManager.StartNewGame();
     }
 
+    private void HandleShopClicked()
+    {
+        if (shopController != null)
+        {
+            var shopView = shopController.GetComponentInChildren<ShopView>(true);
+            if (shopView != null)
+            {
+                if (shopView.IsVisible) shopView.Hide();
+                else shopView.Show();
+            }
+        }
+    }
+
+    private void HandleInventoryClicked()
+    {
+        if (inventoryController != null)
+        {
+            var inventoryView = inventoryController.GetComponentInChildren<InventoryView>(true);
+            if (inventoryView != null)
+            {
+                if (inventoryView.IsVisible) inventoryView.Hide();
+                else inventoryView.Show();
+            }
+        }
+    }
+
+    private void HandleCurrencyChanged(int newBalance)
+    {
+        gameInfoView.SetCurrencyText(newBalance);
+        PerformSave();
+    }
+
+    private void HandleInventoryChangedForSave()
+    {
+        PerformSave();
+    }
+
     // ── Helpers ────────────────────────────────────────────────
 
     private void UpdatePreviewScores(int[] diceValues)