feat: 完善模型请求适配与输出限制

apps/api/internal/httpapi/chat_completions_mode_test.go

@@ -142,7 +142,7 @@ func TestWriteCompatibleTaskResponseMapsInvalidParameterToBadRequest(t *testing.
 	executor := &fakeTaskExecutor{
 		runErr: &clients.ClientError{
 			Code:      "invalid_parameter",
-			Message:   "reasoning_effort must be one of: none, minimal, low, medium, high, xhigh",
+			Message:   "reasoning_effort must be one of: none, minimal, low, medium, high, xhigh, max",
 			Retryable: false,
 		},
 	}
@@ -157,6 +157,9 @@ func TestWriteCompatibleTaskResponseMapsInvalidParameterToBadRequest(t *testing.
 	if !strings.Contains(recorder.Body.String(), "invalid_parameter") {
 		t.Fatalf("response should include invalid_parameter code: %s", recorder.Body.String())
 	}
+	if !strings.Contains(recorder.Body.String(), `"type":"invalid_request_error"`) || !strings.Contains(recorder.Body.String(), `"param":null`) {
+		t.Fatalf("response should use OpenAI error fields: %s", recorder.Body.String())
+	}
 }
 
 func TestWriteCompatibleTaskResponseReturnsSSEWhenStreamIsTrue(t *testing.T) {