Add LINE Official Account setup guide to both README.md and README.ja.md,
including configuration, webhook URL setup, and Docker Compose port note.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Fix web_test.go and config_test.go to use current function signatures
after merging upstream changes (WebSearchToolOptions, BraveConfig).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Add LINE Messaging API as the 9th messaging channel using HTTP Webhook.
Supports text/image/audio messages, group chat @mention detection,
reply with quote, and loading animation.
- No external SDK required (standard library only)
- HMAC-SHA256 webhook signature verification
- Reply Token (free) with Push API fallback
- Group chat: respond only when @mentioned
- Quote original message in replies using quoteToken
Closes#146
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
