[Feature Request] Archive Export (Original File + Converted File + Unified Metadata)

Description Feature Request: Archive Export (Original File + Converted File + Unified Metadata) Description Paperless‑ngx currently allows downloading individual files, but there is no way to export a complete, unified archive of a document that includes both the files and all metadata in a structured, machine‑readable format. This feature request proposes an Archive Export option that bundles everything into a single ZIP file for long‑term offline storage, external archiving, or migration to other systems. Problem Exporting a document with all relevant metadata requires multiple manual steps. Users need a self‑contained archive that includes: • the original file • the converted file • all metadata and document information, including the content of the following UI tabs: - *Details* - *Content* - *Metadata* - *History / Audit Trail* Requested Feature Add an “Archive” button to the document view that generates a ZIP file containing:…