Update DocumentUploader to upload all accepted files without filtering by type,
enabling consistent handling of DOCX and other supported formats. Add a default
timeout for DOCX-to-PDF conversion to prevent hanging LibreOffice processes.
This improves reliability and ensures uploads do not silently stall.
Remove the separate docx-to-pdf upload API and integrate DOCX conversion directly into the blob upload finalize route. Update client and uploader logic to treat DOCX as a supported upload type and streamline batch state handling. Adjust document caching and test helpers to align with the new unified flow. Add server-side DOCX-to-PDF conversion utility and corresponding unit tests.
This change simplifies the upload pipeline, consolidates conversion logic, and improves maintainability.
