chore(legacy): drop 15 unused legacy command registrations from invoke_handler

These commands had v2_* equivalents registered alongside them; the
frontend has been migrated and no longer invokes them. The legacy
function definitions remain in their respective modules - they will
be removed in subsequent steps once we verify nothing internally
calls them.

cc

src-tauri/src/lib.rs

@@ -1376,33 +1376,11 @@ pub fn run() {
             commands_v2::v2_get_user_info,
             commands_v2::v2_save_credentials,
             commands_v2::v2_clear_saved_credentials,
-            // Temporary compatibility commands still invoked by frontend during migration
-            offline_cache::commands::check_album_fully_cached,
-            network::commands::check_network_path,
-            offline::commands::create_pending_playlist,
-            offline::commands::get_pending_playlist_count,
-            offline::commands::queue_scrobble,
-            offline::commands::get_queued_scrobbles,
-            offline::commands::get_queued_scrobble_count,
-            offline::commands::cleanup_sent_scrobbles,
-            library::commands::discogs_has_credentials,
-            library::commands::discogs_search_artwork,
-            library::commands::discogs_download_artwork,
-            library::commands::library_update_folder_settings,
-            library::commands::get_track_by_path,
-            commands::search::get_artist_basic,
-            commands::search::get_artist_detail,
-            commands::search::get_artist_tracks,
-            commands::search::get_artist_albums,
-            commands::search::get_releases_grid,
-            commands::playback::get_pipewire_sinks,
-            commands::playback::get_audio_output_status,
             flatpak::get_flatpak_help_text,
             commands_v2::v2_get_flatpak_help_text,
             config::legal_settings::get_qobuz_tos_accepted,
             updates::has_flatpak_welcome_been_shown,
             updates::has_snap_welcome_been_shown,
-            lyrics::commands::lyrics_get,
             config::favorites_cache::is_track_favorite,
             commands_v2::v2_set_api_locale,
             commands_v2::v2_set_use_system_titlebar,