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## Summary by CodeRabbit
* **New Features**
* Improved file and image attachment handling by including MIME type
information for uploads.
* Added a new query to fetch document summaries by workspace and
document IDs.
* **Refactor**
* Minor adjustments to method signatures and property initializations to
streamline code and maintain consistency.
* Updated access levels for certain properties and methods to internal,
enhancing encapsulation.
* **Style**
* Formatting and whitespace clean-up for improved code readability.
No changes to user-facing functionality or behavior.
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