chore: apply pending code updates

src/server/api/anime.py

@@ -724,9 +724,9 @@ async def add_series(
         if series_app and hasattr(series_app, 'loader'):
             try:
                 year = series_app.loader.get_year(key)
-                logger.info(f"Fetched year for {key}: {year}")
+                logger.info("Fetched year for %s: %s", key, year)
             except Exception as e:
-                logger.warning(f"Could not fetch year for {key}: {e}")
+                logger.warning("Could not fetch year for %s: %s", key, e)
         
         # Create folder name with year if available
         if year: