feat(voice): add phase 1.1 partial asr fast ack

.env.example

@@ -50,10 +50,15 @@ AI_WHATSAPP_MAX_KB_RESULTS=3
 AI_WHATSAPP_CONFIDENCE_HANDOFF_THRESHOLD=0.65
 AI_VOICE_RUNTIME_SERVICE_URL=http://localhost:8018
 AI_VOICE_ENABLED=0
-AI_VOICE_POLICY_MODE=llm_guarded
+AI_VOICE_POLICY_MODE=v2_fast_conversational
 AI_VOICE_QUEUE_CONFIG_JSON={}
 AI_VOICE_ASR_PROVIDER=openai
-AI_VOICE_TTS_PROVIDER=openai
+AI_VOICE_TTS_PROVIDER=yandex
+AI_VOICE_V2_ENABLED=1
+AI_VOICE_V2_QUEUE_CODES=voice_lab_ai
+AI_VOICE_V2_ACK_MODE=immediate_short
+AI_VOICE_V2_STREAMING_TTS=1
+AI_VOICE_V2_PARTIAL_ASR=1
 AI_VOICE_AUDIOSOCKET_ENABLED=0
 AI_VOICE_AUDIOSOCKET_HOST=0.0.0.0
 AI_VOICE_AUDIOSOCKET_PORT=9019
@@ -73,7 +78,7 @@ AI_VOICE_TTS_YANDEX_SAMPLE_RATE_HZ=8000
 AI_VOICE_TTS_CACHE_ENABLED=1
 AI_VOICE_TTS_CACHE_DIR=.data/ai_voice_tts_cache
 AI_VOICE_VAD_MIN_SPEECH_MS=300
-AI_VOICE_VAD_TRAILING_SILENCE_MS=700
+AI_VOICE_VAD_TRAILING_SILENCE_MS=400
 AI_VOICE_TURN_MAX_MS=10000
 AI_VOICE_MEDIA_IDLE_TIMEOUT_SECONDS=15
 AI_VOICE_MAX_CONTEXT_SEGMENTS=8