Add Nuggets host upload portal with Seafile integration; v2.0.4

- New /host-upload page: per-host login (username + password) with
  session cookie, drag-and-drop file upload to Seafile via server proxy
- Two upload targets: Episode Upload (audio) and Episode Info (docs)
- Server route: /api/nuggets-upload/* for host auth + file proxy,
  /api/admin/nuggets-upload/hosts for admin CRUD (create/disable/reset pw/delete)
- Admin panel: Nuggets → Upload Portal view to manage host accounts
- Seafile config via SEAFILE_URL / SEAFILE_TOKEN / SEAFILE_NUGGETS_REPO_ID env vars
- Directories default to /Episode Upload and /Episode Info (configurable)
- Uses multer for multipart uploads; 500 MB per-file limit

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

package-lock.json

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