Persist runtime config in app db and seed from env

app/models/__init__.py

@@ -1,6 +1,7 @@
 """SQLAlchemy models package."""
 
 from app.models.auth import AuthSession, AuthUser
+from app.models.config import AppConfigEntry
 from app.models.location import Location
 
-__all__ = ["AuthSession", "AuthUser", "Location"]
+__all__ = ["AppConfigEntry", "AuthSession", "AuthUser", "Location"]