- Add GET /envelope/{account_id}/{message_id} endpoint to retrieve message envelope (metadata)
- Add get_envelope_by_id method to ENVELOPE_INDEX_MANAGER for querying single envelope
- Move message_id from query parameter to path parameter for clearer API paths:
- /message-content/{account_id}/{message_id}
- /download-message/{account_id}/{message_id}
- /download-attachment/{account_id}/{message_id}
- /envelope/{account_id}/{message_id}
- Fix API documentation descriptions to be more accurate:
- search_messages: Now correctly describes search functionality
- get_thread_messages: Mentions thread_id requirement
- proxy endpoints: Fixed copy-paste errors from OAuth2 docs
- Update frontend API client to use new path-based URLs
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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