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/entities/series.py

@@ -271,10 +271,11 @@ class Serie:
             'Dororo (2025)'
         """
         if self._year:
+            import re
             year_suffix = f" ({self._year})"
-            if self._name.endswith(year_suffix):
-                return self._name
-            return f"{self._name}{year_suffix}"
+            # Strip ALL trailing year suffixes before appending to prevent duplication
+            clean_name = re.sub(r'(\s*\(\d{4}\))+\s*$', '', self._name).strip()
+            return f"{clean_name}{year_suffix}"
         return self._name
 
     @property