feat(System): Language switch, supports Traditional Chinese.

backend/apps/chat/models/chat_model.py

@@ -355,7 +355,7 @@ class McpQuestion(BaseModel):
     chat_id: int = Body(description='会话ID')
     token: str = Body(description='token')
     stream: Optional[bool] = Body(description='是否流式输出，默认为true开启, 关闭false则返回JSON对象', default=True)
-    lang: Optional[str] = Body(description='语言：zh-CN|en|ko-KR', default='zh-CN')
+    lang: Optional[str] = Body(description='语言：zh-CN|zh-TW|en|ko-KR', default='zh-CN')
     datasource_id: Optional[int | str] = Body(description='数据源ID，仅当当前对话没有确定数据源时有效', default=None)
     oid: Optional[str] = Body(
         description='组织ID，仅当数据源ID为空时有效，如果不传则为最后一次登录SQLBot时所使用的组织ID', default=None)

backend/apps/mcp/mcp.py

@@ -131,6 +131,9 @@ async def datasource_list(session: SessionDep, mcp_ds: McpDs):
 @router.post("/mcp_question", operation_id="mcp_question")
 async def mcp_question(session: SessionDep, chat: McpQuestion):
     session_user = get_user(session, chat.token)
+    lang = chat.language
+    if lang in ["zh-CN", "zh-TW", "en", "ko-KR"]:
+        session_user.language = lang
     if chat.oid:
         session_user.oid = int(chat.oid)
     ds_id: Optional[int] = None