https://gitlab.synchro.net/main/sbbs/-/commit/aba7793deb5ba02c61e5065b
Modified Files:
src/sbbs3/atcodes.cpp scfgdefs.h scfglib1.c scfgsave.c
Log Message:
Add @-codes for terminal sound effects and background music

@SOUND:, @MUSIC:, @MUSICVOL:, @MUSICOFF@, @SOUNDOFF@ and @CACHE_AUDIO:,
so a sysop can attach audio to a menu or a prompt without writing any JavaScript.

Nothing reaches a terminal that cannot play it: each code returns
immediately when terminal auto-detection found no libsndfile, or when the
user has set NO_SOUND. Stopping sound is deliberately exempt from the
latter, since the flag can be set while a loop is already playing.

@SOUND: and @MUSIC: take a bare filename under text/sound, resolved in two stages so the argument cannot name anything outside that directory. @CACHE_AUDIO: uploads without playing, for a large file placed where a
delay is acceptable; its type is part of the code name rather than an
argument because the capability gate depends on it, and C;S is a general
verb with no feature query of its own.

Volume is accepted as a percentage or with a dB suffix and always reaches
the wire as dB. SyncTERM's mixer is dB-native and its bare-percent path is clamped at unity and integer-only.

max_sound_file_size and max_cache_file_size in main.ini bound what a
display file can send. They are two separate limits because @SOUND: uploads synchronously while a display file is drawing and @CACHE_AUDIO: does not.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

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