breed_enricher: Wikimedia-Foto-Fetch + alle Rassen in einem Rutsch (limit 2000)

- breed_enricher: _fetch_wikimedia_photo() (de/en Fallback via Wikipedia API)
- breed_enricher: foto_url nach KI-Anreicherung automatisch befüllen
- scheduler: Startup- und Nacht-Job auf limit=2000 (357 ausstehende Rassen)
- scheduler: Status-Report alle 2h statt 2×/Tag
- dogs.py: sitting_access → sitting_subscriptions (SQL-Fix)

backend/routes/dogs.py

@@ -267,7 +267,7 @@ async def get_dog_skills(dog_id: int, user=Depends(get_current_user)):
     uid = user["id"]
     with db() as conn:
         dog = conn.execute(
-            "SELECT id, user_id FROM dogs WHERE id=? AND (user_id=? OR id IN (SELECT dog_id FROM sitting_access WHERE friend_id=? AND expires_at > datetime('now')))",
+            "SELECT id, user_id FROM dogs WHERE id=? AND (user_id=? OR id IN (SELECT dog_id FROM sitting_subscriptions WHERE sitter_id=? AND valid_until >= date('now')))",
             (dog_id, uid, uid)
         ).fetchone()
         if not dog: