Bundled webfonts for the VUMU admin upload screen only.

- Inter (latin subset) — https://github.com/rsms/inter — SIL Open Font License 1.1
- IBM Plex Mono (latin, 400/500/600) — https://github.com/IBM/plex — SIL Open Font License 1.1

Fonts are loaded from assets/fonts/fonts.css (no Google Fonts CDN).
