Add pymysql dependency for MySQL user management

Author: kakack

poetry.lock

@@ -164,6 +164,10 @@ python-dotenv = "^1.1.1"
 langgraph = "^0.5.1"
 langmem = "^0.0.27"
 
+
+[tool.poetry.group.mem-user.dependencies]
+pymysql = "^1.1.2"
+
 [[tool.poetry.source]]
 name = "mirrors"
 url = "https://mirrors.tuna.tsinghua.edu.cn/pypi/web/simple/"