feat: integrate VAPI functionality with voice assistant support and e…

[mashharuki]

This pull request introduces significant updates to integrate VAPI (Voice Assistant API) functionality into the frontend_vapi project. The changes include adding environment variables for configuration, modifying the AgentChat component to support VAPI-based voice conversations, and implementing a custom hook (useVapi) for managing VAPI interactions. These updates enhance the application's capabilities by enabling voice-based task creation and assistant interactions.

VAPI Integration:

• Environment Configuration: Added NEXT_PUBLIC_VAPI_ASSISTANT_ID to .env.example and .env.local for VAPI assistant identification. [1] [2]
• Custom Hook (useVapi): Implemented useVapi to manage VAPI client initialization, event handling, and assistant interactions. This includes methods for starting/stopping calls, managing error states, and handling user messages.

Updates to AgentChat Component:

• VAPI Integration: Replaced the voice recording functionality with VAPI-based voice conversations, including state management for calls, error handling, and assistant messages.
• UI Enhancements: Updated the UI to reflect VAPI-specific features, such as displaying assistant configuration status, conversation messages, and ready status indicators. [1] [2]
• Environment Variable Support: Introduced support for NEXT_PUBLIC_VAPI_ASSISTANT_ID in the component for dynamic assistant identification. (frontend_vapi/components/AgentChat.tsxL1-R109R115)…nvironment configuration

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