Introduce MPV process reuse and IPC control, and add basic EPG IPC
handlers.
- Add GET_CHANNEL_PROGRAMS and FETCH_EPG ipc handlers to epg.events.ts
to expose fetching EPG data by channel or URLs.
- Rework player.events.ts:
- Export proper bootstrap and add module-level mpvProcess and
mpvSocketPath to track a reusable MPV instance.
- Add sendMpvCommand helper to communicate with MPV via its IPC socket.
- Implement OPEN_MPV_PLAYER handler that:
- Reads MPV path and MPV_REUSE_INSTANCE setting from store.
- Attempts to reuse an existing MPV process by sending loadfile
command over the socket when reuse is enabled.
- Falls back to spawning a new mpv process, creating a unique IPC
socket path, and storing the process/socket when reuse is enabled.
- Adds error and exit handlers to clear stored references.
- Add necessary imports (ChildProcess, existsSync, createConnection).
- Remove/comment unused import block for shared-interfaces and adapt
existing code to the new flow.
Why:
- Enable reusing a single MPV instance to improve resource usage and
provide faster playback switching.
- Add IPC endpoints for EPG to support frontend requests for program
data.
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