checkpoint: 重写 langchain agent 前的快照

包含未合入 main 的工作:
- CAS 单点登录接入 (CasSecurityConfig + 4 个 CAS 类)
- LoginController 改 POST + body, 修 URL 密码暴露
- chat_test.py 修 texts→text typo
- 前端外部系统侧边栏 + login API POST
- gateway-nginx.conf

下一步: 从这个分支拉 feat/langgraph-rewrite 做 langchain-chat agent 重写
回滚点: git checkout backup/pre-langgraph

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

langchain-chat/server/chat/chat_test.py

@@ -55,11 +55,11 @@ async def get_image(file_name: str):
 
 
 async def thinking_generator(content: str) -> AsyncIterable[str]:
-    """思考过程的异步生成器"""
+    """思考过程的异步生成器（打字机效果，整段约 0.3s 完成）"""
     yield json.dumps({'think': '\n'}, ensure_ascii=False)
-    for i in content:    
+    for i in content:
         yield json.dumps({'think': i}, ensure_ascii=False)
-        await asyncio.sleep(0.1)
+        await asyncio.sleep(0.02)
     yield json.dumps({'think': '\n'}, ensure_ascii=False)
 
 
@@ -296,7 +296,7 @@ async def chat_test(
                         elif "search_answer" in json.loads(response):
                             search_answer = json.loads(response)["search_answer"]
                             # history_summary+= search_answer
-                            yield json.dumps({"texts": search_answer}, ensure_ascii=False)
+                            yield json.dumps({"text": search_answer}, ensure_ascii=False)
                         elif "docs" in json.loads(response):
                             docs = json.loads(response)["docs"]
                         elif "detail" in json.loads(response):
@@ -308,7 +308,7 @@ async def chat_test(
                             # yield json.dumps({"text": image_name}, ensure_ascii=False)
                         else :
                             #history_summary += json.loads(response)["final_answer"]
-                            yield json.dumps({"texts": json.loads(response)["final_answer"]}, ensure_ascii=False)
+                            yield json.dumps({"text": json.loads(response)["final_answer"]}, ensure_ascii=False)
                     if stop == "":
                         continue
                     else: