fix: refine details (#979)

* feat: add parquet preview and extract common DataFrame preview logic

* refactor: improve error messages, prompts, regex, and session loading

* lint

rdagent/utils/env.py

@@ -116,6 +116,7 @@ def pull_image_with_progress(image: str) -> None:
 
 
 class EnvConf(ExtendedBaseSettings):
+    # TODO: add prefix ....
     default_entry: str
     extra_volumes: dict = {}
     running_timeout_period: int = 3600  # 10 minutes