完成门店管理后端接口与任务

src/Application/TakeoutSaaS.Application/App/Stores/Handlers/UpdateStoreFeeCommandHandler.cs

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+using MediatR;
+using Microsoft.Extensions.Logging;
+using TakeoutSaaS.Application.App.Stores.Commands;
+using TakeoutSaaS.Application.App.Stores.Dto;
+using TakeoutSaaS.Domain.Stores.Entities;
+using TakeoutSaaS.Domain.Stores.Enums;
+using TakeoutSaaS.Domain.Stores.Repositories;
+using TakeoutSaaS.Shared.Abstractions.Constants;
+using TakeoutSaaS.Shared.Abstractions.Exceptions;
+using TakeoutSaaS.Shared.Abstractions.Tenancy;
+
+namespace TakeoutSaaS.Application.App.Stores.Handlers;
+
+/// <summary>
+/// 更新门店费用配置处理器。
+/// </summary>
+public sealed class UpdateStoreFeeCommandHandler(
+    IStoreRepository storeRepository,
+    ITenantProvider tenantProvider,
+    ILogger<UpdateStoreFeeCommandHandler> logger)
+    : IRequestHandler<UpdateStoreFeeCommand, StoreFeeDto>
+{
+    /// <inheritdoc />
+    public async Task<StoreFeeDto> Handle(UpdateStoreFeeCommand request, CancellationToken cancellationToken)
+    {
+        // 1. 校验门店状态
+        var tenantId = tenantProvider.GetCurrentTenantId();
+        var store = await storeRepository.FindByIdAsync(request.StoreId, tenantId, cancellationToken);
+        if (store is null)
+        {
+            throw new BusinessException(ErrorCodes.NotFound, "门店不存在");
+        }
+        if (store.AuditStatus != StoreAuditStatus.Activated)
+        {
+            throw new BusinessException(ErrorCodes.Conflict, "门店未激活，无法配置费用");
+        }
+        if (store.BusinessStatus == StoreBusinessStatus.ForceClosed)
+        {
+            throw new BusinessException(ErrorCodes.Conflict, "门店已被强制关闭，无法配置费用");
+        }
+
+        // 2. (空行后) 获取或创建费用配置
+        var fee = await storeRepository.GetStoreFeeAsync(request.StoreId, tenantId, cancellationToken);
+        var isNew = fee is null;
+        fee ??= new StoreFee { StoreId = request.StoreId };
+
+        // 3. (空行后) 应用更新字段
+        fee.MinimumOrderAmount = request.MinimumOrderAmount;
+        fee.BaseDeliveryFee = request.DeliveryFee;
+        fee.PackagingFeeMode = request.PackagingFeeMode;
+        fee.FixedPackagingFee = request.PackagingFeeMode == PackagingFeeMode.Fixed
+            ? request.FixedPackagingFee ?? 0m
+            : 0m;
+        fee.FreeDeliveryThreshold = request.FreeDeliveryThreshold;
+
+        // 4. (空行后) 保存并返回
+        if (isNew)
+        {
+            await storeRepository.AddStoreFeeAsync(fee, cancellationToken);
+        }
+        else
+        {
+            await storeRepository.UpdateStoreFeeAsync(fee, cancellationToken);
+        }
+        await storeRepository.SaveChangesAsync(cancellationToken);
+        logger.LogInformation("更新门店 {StoreId} 费用配置", request.StoreId);
+        return StoreMapping.ToDto(fee);
+    }
+}