chore: 优化业务异常状态码透传规则

src/Core/TakeoutSaaS.Shared.Web/Middleware/ExceptionHandlingMiddleware.cs

@@ -3,6 +3,7 @@ using Microsoft.Extensions.Hosting;
 using Microsoft.Extensions.Logging;
 using System.Text.Json;
 using System.Text.Json.Serialization;
+using System.Collections.Generic;
 using TakeoutSaaS.Shared.Abstractions.Constants;
 using TakeoutSaaS.Shared.Abstractions.Exceptions;
 using TakeoutSaaS.Shared.Abstractions.Results;
@@ -14,6 +15,16 @@ namespace TakeoutSaaS.Shared.Web.Middleware;
 /// </summary>
 public sealed class ExceptionHandlingMiddleware(RequestDelegate next, ILogger<ExceptionHandlingMiddleware> logger, IHostEnvironment environment)
 {
+    private static readonly HashSet<int> AllowedHttpErrorCodes = new()
+    {
+        ErrorCodes.BadRequest,
+        ErrorCodes.Unauthorized,
+        ErrorCodes.Forbidden,
+        ErrorCodes.NotFound,
+        ErrorCodes.Conflict,
+        ErrorCodes.ValidationFailed
+    };
+
     private static readonly JsonSerializerOptions SerializerOptions = new()
     {
         PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
@@ -63,7 +74,10 @@ public sealed class ExceptionHandlingMiddleware(RequestDelegate next, ILogger<Ex
                 StatusCodes.Status422UnprocessableEntity,
                 ApiResponse<object>.Error(ErrorCodes.ValidationFailed, "请求参数验证失败", validationException.Errors)),
             BusinessException businessException => (
-                StatusCodes.Status422UnprocessableEntity,
+                // 1. 仅当业务错误码在白名单且位于 400-499 时透传，否则回退 400
+                AllowedHttpErrorCodes.Contains(businessException.ErrorCode) && businessException.ErrorCode is >= 400 and < 500
+                    ? businessException.ErrorCode
+                    : StatusCodes.Status400BadRequest,
                 ApiResponse<object>.Error(businessException.ErrorCode, businessException.Message)),
             _ => (
                 StatusCodes.Status500InternalServerError,