Builds on the salvaged voice.stop_phrases matcher:
- /api/config merges DEFAULT_CONFIG, so an untouched install reports
stop_phrases: ["stop"] instead of omitting the key. Compare against
/api/config/defaults so that case keeps the built-in English list
("goodbye", "never mind", ...) and only a list the user changed replaces
it. Parse malformed values (mapping, null) as the backend does: default.
- Normalise transcripts and phrases with NFKC and Unicode punctuation
(\p{P}), so NFD Cyrillic from STT, «guillemets» and CJK full stops match.
- Wire the existing voice.barge_in_threshold_multiplier into the desktop
barge-in monitor: it scales the quiet-floor multiplier and the playback
clamp (PLAYBACK_MIN_TRIGGER_LEVEL) by its ratio to the backend default
(3.0), so stock behaviour is unchanged and a quiet BT HFP headset can
interrupt with a lower value. No new setting or env var.
cb7b1b32dd