Move some enumerate type to constants.py (#10998)

### What problem does this PR solve?

As title.

### Type of change

- [x] Refactoring

---------

Signed-off-by: Jin Hai <haijin.chn@gmail.com>

api/apps/sdk/session.py

@@ -41,7 +41,7 @@ from api.utils.api_utils import check_duplicate_ids, get_data_openai, get_error_
 from rag.app.tag import label_question
 from rag.prompts.template import load_prompt
 from rag.prompts.generator import cross_languages, gen_meta_filter, keyword_extraction, chunks_format
-from common.contants import RetCode
+from common.constants import RetCode
 
 @manager.route("/chats/<chat_id>/sessions", methods=["POST"])  # noqa: F821
 @token_required