fix: stabilize puzzle vector engine asset generation

server-rs/crates/api-server/src/external_api_audit.rs

@@ -341,6 +341,8 @@ fn record_external_api_failure_otlp(failure: &ExternalApiFailureDraft) {
         prompt_chars = failure.prompt_chars,
         reference_image_count = failure.reference_image_count,
         image_model = failure.image_model,
+        request_id = %failure.request_id.as_deref().unwrap_or_default(),
+        error_source = %failure.error_source.as_deref().unwrap_or_default(),
         error = %failure.error_message,
         "外部 API 调用失败"
     );
@@ -394,6 +396,10 @@ mod tests {
             )
             .with_status_code(Some(429))
             .with_retryable(true)
+            .with_error_source(Some(
+                "client error (SendRequest) -> connection closed before message completed"
+                    .to_string(),
+            ))
             .with_latency_ms(Some(1234))
             .with_prompt_chars(Some(88))
             .with_reference_image_count(Some(2))
@@ -414,6 +420,10 @@ mod tests {
         assert_eq!(metadata["promptChars"], 88);
         assert_eq!(metadata["referenceImageCount"], 2);
         assert_eq!(metadata["imageModel"], "gpt-image-2-all");
+        assert_eq!(
+            metadata["errorSource"],
+            "client error (SendRequest) -> connection closed before message completed"
+        );
         assert!(matches!(metadata["occurredAt"], Value::String(_)));
     }