fix(deezer): wrap gw.get_track in asyncio.to_thread, cache user ID, add loved tracks support

[berettavexee]

Summary

• Fix: gw.get_track() was called synchronously inside an async context, blocking the event loop during concurrent downloads. Wrapped in asyncio.to_thread() to match all other GW API calls in this file.
• Perf: Cache the logged-in user ID as logged_in_user_id during login() so that get_user_favorites() does not make a redundant get_user_data() API round-trip on every call.
• Feat: Add DeezerFavoriteURL to support liked-track profile URLs of the form https://www.deezer.com/fr/profile/USER_ID/loved. Routes through get_playlist() via a synthetic favorites:{user_id} ID and fetches tracks via the GW API (get_my_favorite_tracks for own profile, get_user_tracks for others).
• Refactor: Replace the hardcoded 2000 favorites limit with a class constant max_favorites = 10_000.

Notes

• deezer-py's get_user_tracks() silently drops the limit argument when the target is the logged-in user (it routes to get_my_favorite_tracks() with default limit=25). The fix detects own-profile requests using the cached logged_in_user_id and calls get_my_favorite_tracks() directly with the full limit.

Test plan

• Download a track/album/playlist to verify get_downloadable() still works after the asyncio.to_thread fix
• Run rip url https://www.deezer.com/fr/profile/USER_ID/loved with own profile → resolves all liked tracks
• Run with another user's public profile → resolves their liked tracks

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