fix(nodes): snapshot scanner cache before iterating on executor thread

Node code reads cache.raw_data while MetadataSyncService may mutate it
from a background thread; iterate over a list() snapshot to avoid a
possible 'list changed size during iteration' RuntimeError.

py/nodes/utils.py

@@ -156,7 +156,7 @@ def _find_missing_loras(names: list[str]) -> list[str]:
 
         lookup = {}
         basename_candidates = {}
-        for item in cache.raw_data:
+        for item in list(cache.raw_data):
             file_path = item.get("file_path")
             if not file_path:
                 continue