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

src/core/services/nfo_repair_service.py

@@ -120,6 +120,37 @@ def nfo_needs_repair(nfo_path: Path) -> bool:
     return bool(find_missing_tags(nfo_path))
 
 
+def _read_tmdb_id(nfo_path: Path) -> int | None:
+    """Return the TMDB ID stored in an existing NFO, or ``None``.
+
+    Checks both ``<tmdbid>`` and ``<uniqueid type="tmdb">`` elements.
+
+    Args:
+        nfo_path: Absolute path to the ``tvshow.nfo`` file.
+
+    Returns:
+        Integer TMDB ID, or ``None`` if not found or not parseable.
+    """
+    if not nfo_path.exists():
+        return None
+    try:
+        root = etree.parse(str(nfo_path)).getroot()
+
+        for uniqueid in root.findall(".//uniqueid"):
+            if uniqueid.get("type") == "tmdb" and uniqueid.text:
+                return int(uniqueid.text)
+
+        tmdbid_elem = root.find(".//tmdbid")
+        if tmdbid_elem is not None and tmdbid_elem.text:
+            return int(tmdbid_elem.text)
+
+    except (etree.XMLSyntaxError, ValueError):
+        pass
+    except Exception:  # pylint: disable=broad-except
+        pass
+    return None
+
+
 class NfoRepairService:
     """Service that detects and repairs incomplete tvshow.nfo files.
 

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