fix: IndexError parents[4] on HF container path depth

backend/services/resource_rotation_bridge.py

@@ -39,10 +39,11 @@ def _unified_json_path() -> Path:
     candidates = [
         _workspace_root() / UNIFIED_JSON_NAME,
         _workspace_root() / "api-resources" / UNIFIED_JSON_NAME,
-        here.parents[4] / ".tmp-ds-v2" / UNIFIED_JSON_NAME,
         Path.cwd() / UNIFIED_JSON_NAME,
         Path.cwd() / ".tmp-ds-v2" / UNIFIED_JSON_NAME,
     ]
+    if len(here.parents) > 4:
+        candidates.append(here.parents[4] / ".tmp-ds-v2" / UNIFIED_JSON_NAME)
     for candidate in candidates:
         if candidate.exists():
             return candidate