- Changed HTML body response handling to return Content with
"text/html" content type for better response clarity.
- Added a new `FetchEmailUids` endpoint to retrieve only email
UIDs based on query filters, with proper status handling.
- Updated `FetchEmailByUid` to support an optional `htmlBodyOnly`
parameter, allowing clients to fetch only the HTML body.
- Added XML documentation for new and updated methods.
- Improved response handling and ensured proper HTTP status codes.