Add explicit detectors and optional auth

app/config.py

@@ -1,13 +1,20 @@
 from dataclasses import dataclass
-from dotenv import load_dotenv
 import os
 
+from dotenv import load_dotenv
+
 load_dotenv()
 
 
 @dataclass(frozen=True)
 class Settings:
     env: str = os.getenv("ENV", "prod").strip().lower()
+    auth_token: str = os.getenv("FACE_LOCK_AUTH_TOKEN", "").strip()
+    auth_header_name: str = os.getenv("FACE_LOCK_AUTH_HEADER", "X-API-Key").strip()
+
+    @property
+    def auth_enabled(self) -> bool:
+        return bool(self.auth_token)
 
 
 settings = Settings()