Scarriffle cea96660d9 feat(web): admin area with instance default theme, custom logo/favicon; .theme.json export ...

- Admin settings tab (admin-only) now holds user management plus a server-wide
  default theme editor (live preview + discard) and logo/favicon branding.
- New singleton InstanceSettings model + /api/instance router (public GET for
  the login screen; admin-gated theme PUT and logo/favicon upload/delete,
  reusing the avatar PIL/validation pattern).
- Instance default theme is the base users inherit and the target a per-colour
  "Reset" returns to (baseColor: instance default -> built-in).
- Custom favicon overrides the primary-colour tinting; custom logo replaces the
  top-left glyph+text, hard-capped so it only scales down and never breaks layout.
  Branding + defaults load before login (public endpoint).
- Theme export now uses the recognised .theme.json extension (old .theme still
  imports); import stays partial/unknown-key aware.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

2026-07-20 14:19:15 +02:00

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