Add AnveVoice to Chatbot builder section

[ANVEAI]

Summary

• Adds AnveVoice to the Chatbot builder section in alphabetical order.
• AnveVoice is a voice-first AI agent for websites that trains on your site content, navigates pages, fills forms, and talks to visitors in 50+ languages with <700ms latency.

Checklist

• Entry follows existing format (- [Name](URL) - Description.)
• Placed in alphabetical order
• URL is valid and points to the project homepage