Workstream C: convert commands/player to a folder module, extract remote-session commands
- Move commands/player.rs to commands/player/mod.rs (folder module). - Extract the 5 self-contained remote-session control commands (remote_play_on_session/send_command/session_seek/set_volume/toggle_mute) into commands/player/remote.rs, re-exported via `pub use remote::*` so the command names remain at commands::player::* and the invoke_handler is unchanged. No behavior change; establishes the submodule split pattern for the oversized command file.
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