Store release_date on added movies

Needed so the frontend can sort lists by release date, not just by
when they were added.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

controllers/MovieController.php

@@ -19,7 +19,7 @@ class MovieController {
             return;
         }
         
-        $res = $this->movieModel->add($data['user_id'], $data['tmdb_id'], $data['title'], $data['poster_path'] ?? null, $data['media_type'] ?? 'film');
+        $res = $this->movieModel->add($data['user_id'], $data['tmdb_id'], $data['title'], $data['poster_path'] ?? null, $data['media_type'] ?? 'film', $data['release_date'] ?? null);
         echo json_encode(["success" => $res]);
     }