refactor: harden ChatGPT token lifecycle with startup recovery, single-writer locking, and faster auth flow

src/providers/chatgpt/tokens.py

@@ -3,9 +3,12 @@ import time
 import os
 import aiohttp
 from pathlib import Path
+import logging
 
 from providers.base import ProviderTokens
 
+logger = logging.getLogger(__name__)
+
 DATA_DIR = Path(os.environ.get("DATA_DIR", "./data"))
 TOKENS_FILE = DATA_DIR / "chatgpt_tokens.json"
 
@@ -66,17 +69,17 @@ async def refresh_tokens(refresh_token: str) -> ProviderTokens | None:
 async def get_valid_tokens() -> ProviderTokens | None:
     tokens = load_tokens()
     if not tokens:
-        print("No tokens found")
+        logger.info("No tokens found")
         return None
 
     if tokens.is_expired:
-        print("Token expired, refreshing...")
+        logger.info("Token expired, refreshing...")
         if not tokens.refresh_token:
-            print("No refresh token available")
+            logger.info("No refresh token available")
             return None
         new_tokens = await refresh_tokens(tokens.refresh_token)
         if not new_tokens:
-            print("Failed to refresh token")
+            logger.warning("Failed to refresh token")
             return None
         save_tokens(new_tokens)
         return new_tokens