feat: default TTS model overrides on (#1559) (thanks @Glucksberg)

Co-authored-by: Glucksberg <80581902+Glucksberg@users.noreply.github.com>

docs/tools/slash-commands.md

@@ -67,13 +67,7 @@ Text + native (when enabled):
 - `/config show|get|set|unset` (persist config to disk, owner-only; requires `commands.config: true`)
 - `/debug show|set|unset|reset` (runtime overrides, owner-only; requires `commands.debug: true`)
 - `/usage off|tokens|full|cost` (per-response usage footer or local cost summary)
-- `/tts_on` (enable TTS replies)
-- `/tts_off` (disable TTS replies)
-- `/tts_provider [openai|elevenlabs]` (set or show TTS provider)
-- `/tts_limit <chars>` (max chars before TTS summarization)
-- `/tts_summary on|off` (toggle TTS auto-summary)
-- `/tts_status` (show TTS status)
-- `/audio <text>` (convert text to a TTS audio reply)
+- `/tts on|off|status|provider|limit|summary|audio` (control TTS; see [/tts](/tts))
 - `/stop`
 - `/restart`
 - `/dock-telegram` (alias: `/dock_telegram`) (switch replies to Telegram)