fix for strava auth

bincio/serve/cli.py

@@ -19,9 +19,10 @@ console = Console()
 @click.option("--strava-client-id", default=None, envvar="STRAVA_CLIENT_ID", help="Strava OAuth client ID (enables per-user Strava sync)")
 @click.option("--strava-client-secret", default=None, envvar="STRAVA_CLIENT_SECRET", help="Strava OAuth client secret")
 @click.option("--max-users", default=None, type=int, help="Override max users for this instance (0 = unlimited; updates the DB setting)")
+@click.option("--public-url", default=None, envvar="PUBLIC_URL", help="Public base URL (e.g. https://yourdomain.com). Required for Strava OAuth to work behind a reverse proxy.")
 def serve(data_dir: str, site_dir: Optional[str], host: str, port: int,
           strava_client_id: Optional[str], strava_client_secret: Optional[str],
-          max_users: Optional[int]) -> None:
+          max_users: Optional[int], public_url: Optional[str]) -> None:
     """Start the bincio multi-user application server.
 
     Handles auth, user management, and write operations.
@@ -51,6 +52,8 @@ def serve(data_dir: str, site_dir: Optional[str], host: str, port: int,
         srv.strava_client_id = strava_client_id
     if strava_client_secret:
         srv.strava_client_secret = strava_client_secret
+    if public_url:
+        srv.public_url = public_url
 
     db = open_db(dd)
     current_limit = get_setting(db, "max_users")