- Refactor messaging API endpoints for admin, shop, and vendor - Add message-specific exceptions (ConversationNotFoundException, etc.) - Enhance messaging service with additional helper methods - Add comprehensive test fixtures for messaging - Add integration tests for admin and vendor messaging APIs - Add unit tests for messaging and attachment services 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>