fix(deezer): use artist ID to detect Various Artists releases

[aaronk6]

Description

Fixes #4956

The Deezer API apparently uses IP geolocation to return a localized “Various Artists” name (e.g. “Verschiedene Interpreten” in German), causing VA releases to match poorly and display the wrong artist name.

This implements the approach suggested by @sampsyo in beetbox/beets#4956: detect VA releases using Deezer’s (hopefully) stable various artists ID (5080) instead of a string comparison, then replace the localized name with the user’s configured va_name, mirroring what the MusicBrainz plugin already does with its own VARIOUS_ARTISTS_ID.

To Do

• Documentation.
• Changelog.
• Tests.

[github-actions]

Thank you for the PR! The changelog has not been updated, so here is a friendly reminder to check if you need to add an entry.

[Copilot]

Pull request overview

grug see PR fix Deezer Various Artists problem when API give localized name (like German). PR try detect VA by stable Deezer artist id (5080) and then use user va_name, like MusicBrainz plugin do.

Changes:

• add Deezer VARIOUS_ARTISTS_ID = 5080 constant
• detect VA albums via artist id and set album artist (and artist_credit) to configured va_name
• simplify AlbumInfo.va flag to use this id-based check

[codecov]

Codecov Report

❌ Patch coverage is 33.33333% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.16%. Comparing base (095ec96) to head (4492544).
⚠️ Report is 6 commits behind head on master.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
beetsplug/deezer.py	33.33%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6499      +/-   ##
==========================================
- Coverage   70.17%   70.16%   -0.01%     
==========================================
  Files         147      147              
  Lines       18657    18662       +5     
  Branches     3039     3040       +1     
==========================================
+ Hits        13092    13095       +3     
- Misses       4923     4926       +3     
+ Partials      642      641       -1     

Files with missing lines	Coverage Δ
beetsplug/deezer.py	17.85% <33.33%> (+0.07%)	⬆️

... and 2 files with indirect coverage changes

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[snejus]

Looks great, just add a note to the changelog please.

[snejus]

Please ignore my attempts to adjust the PR title 😁 I was testing our new workflow which automatically adds plugin labels to PRs.

[snejus]

@aaronk6 see below

Looks great, just add a note to the changelog please.

[aaronk6]

@snejus It’s done now. Thanks for the review!