Adopted nomad to route all upload processing to the same worker and using local memory as staging fs.

Added basic backend info and statistic to search index. Update search entries after publish (with user metadata+pid).

Added publish with embargo to GUI. Added terms to GUI. Refactored commit->publish in API. Fixed read-only repo db bug.

Changed the gui to reflect delete and commit running as processes. Overhawled gui API error handling. Improved the upload view.