init, add/delete/edit vlans and devices

app/auth.py

@@ -0,0 +1,15 @@
+import secrets
+
+from fastapi import Security
+from fastapi.security import APIKeyHeader
+
+from .config import get_settings
+from .errors import APIError
+
+api_key_header = APIKeyHeader(name="X-API-Key", auto_error=False)
+
+
+def require_api_key(api_key: str | None = Security(api_key_header)) -> None:
+    expected = get_settings().api_key
+    if not api_key or not secrets.compare_digest(api_key, expected):
+        raise APIError(status_code=401, detail="Invalid or missing API key")