fix 01.ai url error (#1977)

### What problem does this PR solve?

#1976  fix 01.ai url error

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

---------

Co-authored-by: Zhedong Cen <cenzhedong2@126.com>

rag/llm/chat_model.py

@@ -1033,7 +1033,7 @@ class SILICONFLOWChat(Base):
 
 
 class YiChat(Base):
-    def __init__(self, key, model_name, base_url="https://api.lingyiwanwu.com/v1"):
+    def __init__(self, key, model_name, base_url="https://api.01.ai/v1"):
         if not base_url:
-            base_url = "https://api.lingyiwanwu.com/v1"
+            base_url = "https://api.01.ai/v1"
         super().__init__(key, model_name, base_url)