fix(recipe): treat transient server errors (524/5xx) as non-fatal in image info fetch

Extend _is_transient_server_error() check introduced in 15dfaed4 to
get_image_info(), so Cloudflare 524 and generic 5xx errors during
remote recipe import are logged as info instead of error and do not
produce scary tracebacks.

Same pattern as get_model_versions() - transient upstream failures
return None gracefully rather than being logged as errors.

py/services/civitai_client.py

@@ -562,6 +562,13 @@ class CivitaiClient:
             if not success:
                 if is_expected_offline_error(result):
                     return None
+                if self._is_transient_server_error(str(result)):
+                    logger.info(
+                        "Transient server error fetching image info for ID %s: %s",
+                        image_id,
+                        result,
+                    )
+                    return None
                 logger.error(
                     "Failed to fetch image info for ID %s from civitai.red: %s",
                     image_id,