fix: align backend APIs and upload flow

IM.ASPNETCore/ExceptionMiddleware.cs

@@ -1,15 +1,19 @@
 using IM.Commons;
 using IM.DomainCommons;
 using Microsoft.AspNetCore.Http;
+using Microsoft.Extensions.Logging;
 
 namespace IM.ASPNETCore
 {
     public class ExceptionMiddleware
     {
         private readonly RequestDelegate _next;
-        public ExceptionMiddleware(RequestDelegate next)
+        private readonly ILogger<ExceptionMiddleware> logger;
+
+        public ExceptionMiddleware(RequestDelegate next, ILogger<ExceptionMiddleware> logger)
         {
             _next = next;
+            this.logger = logger;
         }
 
         public async Task InvokeAsync(HttpContext context)
@@ -22,12 +26,35 @@ namespace IM.ASPNETCore
             {
                 await DomainExceptionHandlerAsync(context, ex);
             }
+            catch (Exception ex)
+            {
+                await UnhandledExceptionHandlerAsync(context, ex);
+            }
         }
 
         public Task DomainExceptionHandlerAsync(HttpContext context, DomainException ex)
         {
             context.Response.ContentType = "application/json";
-            var result = Result<object>.Fail(ResultCode.PARAMETER_ERROR, ex.Message); // 包装成你的 Result
+            context.Response.StatusCode = StatusCodes.Status400BadRequest;
+            var result = Result<object>.Fail(ResultCode.PARAMETER_ERROR, ex.Message);
+            return context.Response.WriteAsJsonAsync(result);
+        }
+
+        private Task UnhandledExceptionHandlerAsync(HttpContext context, Exception ex)
+        {
+            var correlationId = context.TraceIdentifier;
+            logger.LogError(ex,
+                "Unhandled exception. CorrelationId: {CorrelationId}, Path: {Path}",
+                correlationId,
+                context.Request.Path);
+
+            context.Response.ContentType = "application/json";
+            context.Response.StatusCode = StatusCodes.Status500InternalServerError;
+            context.Response.Headers["X-Correlation-ID"] = correlationId;
+
+            var result = Result<object>.Fail(
+                ResultCode.SYSTEM_ERROR,
+                $"系统错误，关联编号：{correlationId}");
             return context.Response.WriteAsJsonAsync(result);
         }
     }