feat(ai): Finalize voice operator persona and voice name flow

.env.example

@@ -36,6 +36,8 @@ AI_API_BASE=
 AI_API_KEY=
 AI_MODEL=stub-telegram-assistant
 AI_TIMEOUT_SECONDS=20
+AI_CUSTOMER_PERSONA_MODE=operator_humanlike
+AI_DISCLOSURE_MODE=hidden
 AI_TELEGRAM_ENABLED=0
 AI_TELEGRAM_ALWAYS_REPLY=0
 AI_TELEGRAM_MAX_CONTEXT_MESSAGES=20
@@ -48,6 +50,7 @@ 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_QUEUE_CONFIG_JSON={}
 AI_VOICE_ASR_PROVIDER=openai
 AI_VOICE_TTS_PROVIDER=openai