fix(deezer): paginate song.getFavoriteIds to fetch all loved tracks

[berettavexee]

Problem

song.getFavoriteIds silently caps responses at roughly 25 entries per call regardless of the nb= parameter. The previous implementation (absent from upstream, proposed in #987) called get_user_tracks() / get_my_favorite_tracks(), which suffer the same cap. Users with more than ~25 favorites only had a fraction of their library downloaded.

A secondary issue affects family/multi-account setups: comparing the URL user_id against logged_in_user_id to detect "own profile" is unreliable because change_account() shifts current_user to a child profile whose id differs from the main account's USER_ID that authenticated the ARL. The comparison always fell into the "other user" branch and called get_user_tracks() without pagination.

Fix

• Paginate song.getFavoriteIds via start= until the server returns an empty page. start advances by the actual count returned (not the requested page size) to handle any server-side page size.
• Remove the UID comparison entirely: song.getFavoriteIds carries no user_id parameter and always returns the authenticated account's favorites — making it the correct call regardless of account type.
• Cache logged_in_user_id during login() from get_user_data() for future use without additional round-trips.
• Add DeezerFavoriteURL to parse_url.py to support profile liked-track URLs: https://www.deezer.com/{locale}/profile/{user_id}/loved

This supersedes #987.

Verified with

• User with 406 favorites: 6× getFavoriteIds calls (5 data pages of ~100 entries + 1 empty terminator) → all 406 tracks resolved.
• Family account (child profile id ≠ main account USER_ID): favorites fetched correctly without falling into the wrong API branch.

Test plan

• rip url https://www.deezer.com/fr/profile/USER_ID/loved with own profile → resolves all liked tracks (not capped at ~25)
• Same with a family account (child profile) → resolves correctly
• Standard track/album/playlist downloads unaffected

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