fix: print config hint when logs token is missing

--once --logs now exits 2 with a clear pointer to SHUSUB2_LOGS_TOKEN /
~/.config/shusub2/logs-token instead of a raw HTTP 401 traceback; the TUI
logs page reuses the same hint.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

sub2api_quota_tui.py

@@ -906,10 +906,7 @@ def run_textual(
         def refresh_data(self) -> None:
             status = self.query_one("#status", Static)
             if not str(logs_token or "").strip():
-                status.update(
-                    "logs token not configured: set SHUSUB2_LOGS_TOKEN or write the Sub2API admin API key to "
-                    f"{logs_token_config_file_path()}"
-                )
+                status.update(logs_token_hint())
                 return
             status.update("refreshing logs...")
             try:
@@ -972,6 +969,13 @@ def run_textual(
     return 0
 
 
+def logs_token_hint() -> str:
+    return (
+        "logs token not configured: set SHUSUB2_LOGS_TOKEN or write the Sub2API admin API key to "
+        f"{logs_token_config_file_path()}"
+    )
+
+
 def build_parser() -> argparse.ArgumentParser:
     parser = argparse.ArgumentParser(description="Sub2API quota and daily usage TUI")
     parser.add_argument("--api-url", default=default_api_url())
@@ -1034,6 +1038,9 @@ def main(argv: list[str] | None = None) -> int:
         if version_message:
             print(version_message)
         if args.logs:
+            if not str(args.logs_token or "").strip():
+                print(logs_token_hint(), file=sys.stderr)
+                return 2
             print_logs_once(fetch_logs_payload(args.logs_url, args.logs_token, args.timeout, logs_limit), args.filter)
             return 0
         status_payload, status_error = fetch_optional_payload(status_url, args.timeout)