Services set the original language, track names, repack flags, editions and track.data inside get_tracks; the client dropped them so --remote muxed with no default audio and could not select "orig". Also round-trip Song titles, subtitle DRM, PlayReady PSSH, exact bitrate and path-only attachments.
Renames 314 defs and 41 module/class-level constants. Keeps 11 names underscored where the stripped form collides in scope, plus 5.5.0 shims for the three symbols external service repos call.
Adds prompt_user() and uses it for local, remote, and Proton VPN input. Replaces click.prompt on the remote auth path, which ignored the theme and overlapped active Live displays. Remote auth now exits on EOF instead of POSTing an empty answer and spinning the poll loop.
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