Allow deleting unused library files with profile guards

profiles.py

@@ -143,6 +143,9 @@ class Profiles:
   if kind in ('image','video') and (params['width']%64 or params['height']%64):raise ValueError('Breite und Höhe müssen durch 64 teilbar sein.')
   if kind=='chat' and params['ubatch']>params['batch']:raise ValueError('Microbatch darf nicht größer als Batch sein.')
   with self.lock:
+   # Recheck under the profile lock so a concurrent library deletion cannot
+   # leave a newly saved profile pointing at a removed file.
+   self.catalog.entry(data['model_id'])
    existing=next((p for p in self.rows if p['id']==data['id']),None)
    if data['id'] is not None and not existing:raise ValueError('Profil nicht gefunden.')
    if data['revision']!=(existing['revision'] if existing else 0):raise ValueError('Profil wurde zwischenzeitlich geändert. Ansicht neu laden.')
@@ -154,6 +157,12 @@ class Profiles:
    temp=self.path.with_suffix('.tmp');temp.write_text(json.dumps(rows));temp.replace(self.path);self.rows=rows
    return row
 
+ def references(self,model_id):
+  with self.lock:
+   return [dict(id=p['id'],name=p['name'],kind=p['kind']) for p in self.rows
+           if model_id in (p.get('model_id'),p.get('parameters',{}).get('vision_projector'))
+           or model_id in (p.get('components') or {}).values()]
+
  def configure_prompt_enhancer(self,data):
   if not isinstance(data,dict) or set(data)!={'id','revision','prompt_enhancer'}:raise ValueError('Ungültige Prompt-Aufwerter-Einstellung.')
   config=data['prompt_enhancer']