Add remove rating feature

Bouton ✕ sur les films notés 10/10 pour supprimer la note via DELETE /api/rate/:id.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

trakt.py

@@ -23,6 +23,16 @@ class TraktClient:
         ratings_r.raise_for_status()
         return watched_r.json(), ratings_r.json()
 
+    async def remove_rating(self, trakt_id: int):
+        async with httpx.AsyncClient(timeout=30) as client:
+            r = await client.post(
+                f"{self.BASE_URL}/sync/ratings/remove",
+                headers=self.headers,
+                json={"movies": [{"ids": {"trakt": trakt_id}}]},
+            )
+        r.raise_for_status()
+        return r.json()
+
     async def rate_movie(self, trakt_id: int, rating: int):
         async with httpx.AsyncClient(timeout=30) as client:
             r = await client.post(