Add ElevenLabs v3 model and change voice to Olivia

- Change default voice ID from Rachel to Olivia (spzDnDXYekkOPfsxp0U3)
- Add eleven-v3 model (eleven_v3)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

tts.py

@@ -45,7 +45,7 @@ CHANNEL_HANA_1_1_URL = os.getenv(
 )
 
 ELEVENLABS_API_KEY = os.getenv("ELEVENLABS_API_KEY")
-ELEVENLABS_VOICE_ID = os.getenv("ELEVENLABS_VOICE_ID", "21m00Tcm4TlvDq8ikWAM")  # Rachel (기본)
+ELEVENLABS_VOICE_ID = os.getenv("ELEVENLABS_VOICE_ID", "spzDnDXYekkOPfsxp0U3")  # Olivia (기본)
 
 SUPERTONE_API_KEY = os.getenv("SUPERTONE_API_KEY")
 SUPERTONE_VOICE_ID = os.getenv("SUPERTONE_VOICE_ID", "91992bbd4758bdcf9c9b01")  # 기본 보이스
@@ -202,6 +202,10 @@ model_mapping = {
         "provider": "elevenlabs",
         "model": "eleven_multilingual_v2",
     },
+    "eleven-v3": {
+        "provider": "elevenlabs",
+        "model": "eleven_v3",
+    },
     # OpenAI TTS (gpt-4o-mini-tts)
     "openai-gpt-4o-mini-tts": {
         "provider": "openai",