feat(project): 新增包装费模式切换接口

src/Api/TakeoutSaaS.TenantApi/Contracts/Store/StoreFeesContracts.cs

@@ -104,6 +104,21 @@ public sealed class StoreFeesSettingsDto
     public StoreOtherFeesDto OtherFees { get; set; } = new();
 }
 
+/// <summary>
+/// 保存包装费模式请求。
+/// </summary>
+public sealed class SaveStoreFeesModeRequest
+{
+    /// <summary>
+    /// StoreId。
+    /// </summary>
+    public string StoreId { get; set; } = string.Empty;
+    /// <summary>
+    /// PackagingFeeMode。
+    /// </summary>
+    public string PackagingFeeMode { get; set; } = "order";
+}
+
 /// <summary>
 /// 复制费用请求。
 /// </summary>

src/Api/TakeoutSaaS.TenantApi/Controllers/StoreFeesController.cs

@@ -87,6 +87,40 @@ public sealed class StoreFeesController(
         return ApiResponse<StoreFeesSettingsDto>.Ok(MapFeeSettings(parsedStoreId, result));
     }
 
+    /// <summary>
+    /// 保存包装费收取方式。
+    /// </summary>
+    [HttpPost("fees/mode/save")]
+    [ProducesResponseType(typeof(ApiResponse<object>), StatusCodes.Status200OK)]
+    public async Task<ApiResponse<object>> SaveMode([FromBody] SaveStoreFeesModeRequest request, CancellationToken cancellationToken)
+    {
+        var parsedStoreId = StoreApiHelpers.ParseRequiredSnowflake(request.StoreId, "storeId");
+        var packagingFeeMode = ParsePackagingFeeMode(request.PackagingFeeMode);
+        var (tenantId, merchantId) = StoreApiHelpers.GetTenantMerchantContext(storeContextService);
+        var store = await StoreApiHelpers.EnsureStoreAccessibleAsync(dbContext, tenantId, merchantId, parsedStoreId, cancellationToken);
+
+        var fee = await dbContext.StoreFees
+            .FirstOrDefaultAsync(x => x.TenantId == tenantId && x.StoreId == parsedStoreId, cancellationToken);
+        if (fee is null)
+        {
+            fee = new StoreFee
+            {
+                StoreId = parsedStoreId,
+                TenantId = store.TenantId
+            };
+            await dbContext.StoreFees.AddAsync(fee, cancellationToken);
+        }
+
+        fee.PackagingFeeMode = packagingFeeMode;
+        if (packagingFeeMode == PackagingFeeMode.PerItem)
+        {
+            fee.OrderPackagingFeeMode = OrderPackagingFeeMode.Fixed;
+        }
+
+        await dbContext.SaveChangesAsync(cancellationToken);
+        return ApiResponse<object>.Ok(null);
+    }
+
     /// <summary>
     /// 复制费用设置。
     /// </summary>