feat: migrate snowflake ids and refresh migrations

src/Domain/TakeoutSaaS.Domain/Ordering/Entities/CartItem.cs

@@ -11,17 +11,17 @@ public sealed class CartItem : MultiTenantEntityBase
     /// <summary>
     /// 所属购物车标识。
     /// </summary>
-    public Guid ShoppingCartId { get; set; }
+    public long ShoppingCartId { get; set; }
 
     /// <summary>
     /// 商品或 SKU 标识。
     /// </summary>
-    public Guid ProductId { get; set; }
+    public long ProductId { get; set; }
 
     /// <summary>
     /// SKU 标识。
     /// </summary>
-    public Guid? ProductSkuId { get; set; }
+    public long? ProductSkuId { get; set; }
 
     /// <summary>
     /// 商品名称快照。

src/Domain/TakeoutSaaS.Domain/Ordering/Entities/CartItemAddon.cs

@@ -10,7 +10,7 @@ public sealed class CartItemAddon : MultiTenantEntityBase
     /// <summary>
     /// 所属购物车条目。
     /// </summary>
-    public Guid CartItemId { get; set; }
+    public long CartItemId { get; set; }
 
     /// <summary>
     /// 选项名称。
@@ -25,5 +25,5 @@ public sealed class CartItemAddon : MultiTenantEntityBase
     /// <summary>
     /// 选项 ID（可对应 ProductAddonOption）。
     /// </summary>
-    public Guid? OptionId { get; set; }
+    public long? OptionId { get; set; }
 }

src/Domain/TakeoutSaaS.Domain/Ordering/Entities/CheckoutSession.cs

@@ -11,12 +11,12 @@ public sealed class CheckoutSession : MultiTenantEntityBase
     /// <summary>
     /// 用户标识。
     /// </summary>
-    public Guid UserId { get; set; }
+    public long UserId { get; set; }
 
     /// <summary>
     /// 门店标识。
     /// </summary>
-    public Guid StoreId { get; set; }
+    public long StoreId { get; set; }
 
     /// <summary>
     /// 会话 Token。

src/Domain/TakeoutSaaS.Domain/Ordering/Entities/ShoppingCart.cs

@@ -11,12 +11,12 @@ public sealed class ShoppingCart : MultiTenantEntityBase
     /// <summary>
     /// 用户标识。
     /// </summary>
-    public Guid UserId { get; set; }
+    public long UserId { get; set; }
 
     /// <summary>
     /// 门店标识。
     /// </summary>
-    public Guid StoreId { get; set; }
+    public long StoreId { get; set; }
 
     /// <summary>
     /// 购物车状态，包含正常/锁定。