- Add examples for Telegram, Discord, Slack (current primary channels)
- Add examples for AI providers (Anthropic, OpenAI, Gemini)
- Add examples for optional services (Brave Search, ElevenLabs)
- Mark legacy Twilio config as deprecated
- Add helpful comments and links to get API keys
This makes it much easier for new users to understand what
environment variables are available and how to configure them.
