fix: strip all trailing year suffixes to prevent duplication

- series.py: use regex to remove all trailing (YYYY) before appending year
- nfo_service.py: _extract_year_from_name strips all trailing year suffixes
- nfo_repair_service.py: add _read_tmdb_id() helper to extract TMDB ID from NFO

src/core/services/nfo_service.py

@@ -83,11 +83,12 @@ class NFOService:
             >>> _extract_year_from_name("Attack on Titan")
             ("Attack on Titan", None)
         """
-        # Match year in parentheses at the end: (YYYY)
+        # Match the last year in parentheses at the end: (YYYY)
         match = re.search(r'\((\d{4})\)\s*$', serie_name)
         if match:
             year = int(match.group(1))
-            clean_name = serie_name[:match.start()].strip()
+            # Strip ALL trailing year suffixes to get a fully clean name
+            clean_name = re.sub(r'(\s*\(\d{4}\))+\s*$', '', serie_name).strip()
             return clean_name, year
         return serie_name, None