feat: Implement a comprehensive audit log system with a dedicated dashboard page and backend API.

backend/core/context.py

@@ -0,0 +1,10 @@
+from contextvars import ContextVar
+from typing import Optional, Dict, Any
+
+_user_context: ContextVar[Optional[Dict[str, Any]]] = ContextVar("user_context", default=None)
+
+def get_user_context() -> Optional[Dict[str, Any]]:
+    return _user_context.get()
+
+def set_user_context(user: Dict[str, Any]) -> None:
+    _user_context.set(user)