added voice functionality and increased avatar size

backend/app/routers/voice.py

@@ -20,11 +20,10 @@ async def voice_config(user: User = Depends(get_current_user)):
     """Return current voice mode so frontend knows whether to use browser or API."""
     settings = get_settings()
     # API STT (Whisper) works with OpenAI-compatible providers
-    api_available = bool(
-        settings.voice_mode == "api"
-        and settings.llm_api_key
-        and settings.llm_provider in ("openai",)
-    )
+    # Check if we have a dedicated voice key OR a generic LLM key for OpenAI
+    has_key = bool(settings.openai_api_key or (settings.llm_api_key and settings.llm_provider == "openai"))
+    
+    api_available = bool(settings.voice_mode == "api" and has_key)
     return VoiceConfigOut(
         voice_mode=settings.voice_mode,
         voice_api_available=api_available,