Simplify to memory system api

memory_system_api/auth.py

@@ -0,0 +1,12 @@
+"""API key auth for Memory System API."""
+from __future__ import annotations
+
+from fastapi import Header, HTTPException, status
+
+from .config import get_config
+
+
+def verify_api_key(x_api_key: str | None = Header(default=None)) -> None:
+    expected = get_config().server.api_key
+    if expected and x_api_key != expected:
+        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Invalid API key")