Fixes error: "updateVoiceApiType is not a function"
Changes:
- Add voiceApiType state to VoiceContext
- Implement updateVoiceApiType callback
- Load saved voice API type from SecureStore on mount
- Use voiceApiType in sendTranscript (instead of hardcoded 'ask_wellnuo_ai')
- Add console.log showing which API type is being used
- Export voiceApiType and updateVoiceApiType in context provider
Now Voice API selector in Profile works correctly and logs show which API function (voice_ask or ask_wellnuo_ai) is being called.