feat: 管理端核心实体CRUD补齐

src/Api/TakeoutSaaS.AdminApi/Controllers/MerchantsController.cs

@@ -55,6 +55,38 @@ public sealed class MerchantsController : BaseApiController
         return ApiResponse<IReadOnlyList<MerchantDto>>.Ok(result);
     }
 
+    /// <summary>
+    /// 更新商户。
+    /// </summary>
+    [HttpPut("{merchantId:long}")]
+    [PermissionAuthorize("merchant:update")]
+    [ProducesResponseType(typeof(ApiResponse<MerchantDto>), StatusCodes.Status200OK)]
+    [ProducesResponseType(typeof(ApiResponse<object>), StatusCodes.Status404NotFound)]
+    public async Task<ApiResponse<MerchantDto>> Update(long merchantId, [FromBody] UpdateMerchantCommand command, CancellationToken cancellationToken)
+    {
+        command.MerchantId = command.MerchantId == 0 ? merchantId : command.MerchantId;
+
+        var result = await _mediator.Send(command, cancellationToken);
+        return result == null
+            ? ApiResponse<MerchantDto>.Error(ErrorCodes.NotFound, "商户不存在")
+            : ApiResponse<MerchantDto>.Ok(result);
+    }
+
+    /// <summary>
+    /// 删除商户。
+    /// </summary>
+    [HttpDelete("{merchantId:long}")]
+    [PermissionAuthorize("merchant:delete")]
+    [ProducesResponseType(typeof(ApiResponse<object>), StatusCodes.Status200OK)]
+    [ProducesResponseType(typeof(ApiResponse<object>), StatusCodes.Status404NotFound)]
+    public async Task<ApiResponse<object>> Delete(long merchantId, CancellationToken cancellationToken)
+    {
+        var success = await _mediator.Send(new DeleteMerchantCommand { MerchantId = merchantId }, cancellationToken);
+        return success
+            ? ApiResponse<object>.Ok(null)
+            : ApiResponse<object>.Error(ErrorCodes.NotFound, "商户不存在");
+    }
+
     /// <summary>
     /// 获取商户详情。
     /// </summary>