- Updated the `orders.add_attachment` and `orders.list_attachments` tools to utilize the order's own `order_attachements` field, allowing immediate visibility of attachments without requiring a matched quote.
- Enhanced the `POST` route for uploading attachments to support multiple files and improved response structure to include `collectionId` and `collectionName`.
- Merged attachment sources in the `GET` route for matched attachments, providing a unified view of order-level and quote-level files, with a new `source` field to indicate the origin of each attachment.
- Added utility functions for inferring MIME types and attachment kinds based on file extensions, ensuring consistent handling across the application.
- Improved documentation for clarity on the attachment handling process and updated response formats to reflect the new structure.
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