- Introduced new functionality for managing email attachments and drafts in the mail API.
- Added handlers for listing, uploading, and downloading message attachments in `internal/api/mail/handlers_attachments.go`.
- Implemented draft management endpoints for creating, updating, and deleting drafts in `internal/api/mail/handlers_drafts.go`.
- Created new service methods for handling draft and attachment operations in `internal/api/mail/drafts.go` and `internal/api/mail/storage.go`.
- Added validation and error handling for draft and attachment operations.
- Included unit tests for draft and folder functionalities in `internal/api/mail/drafts_test.go` and `internal/api/mail/folders_test.go`.
- Updated API routes to support new draft and attachment features, enhancing overall mail management capabilities.
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