feat(cli): stream — a film or a song played in a media player

`meshbay-cli stream PATH` serves one video or sound file over HTTP on
127.0.0.1 for VLC, mpv or any player that reads HTTP; `--player PROGRAM`
starts the player, and closing it stops the stream, as Ctrl+C does.

The file goes as the node stores it: no remux, no transcode, no stream
slot on the node. Byte ranges are answered from leaseless file_req chunks
decrypted in memory, eight ahead and the last 24 kept. Loopback only, a
random token in the address, a foreign Host refused (DNS rebinding), an
audio or video type with nosniff. The connection is pinged and reopened
when it dies; a refusal by the node stops the stream (exit 5).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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