Swap the generic `fumadocs-ui/og/takumi` default for a hand-crafted OG image using the Sofa cinema theme — dark background, amber accent, DM Serif Display title, DM Sans body, and a radial gradient — matching the app's visual identity.
- Load DM Sans (400/500) and DM Serif Display (400) at runtime from Google Fonts via old Safari UA to get TrueType URLs
- Render header with Sofa logo SVG + "Sofa Docs" label, centered title/description block, and an amber accent bar
- Scale title font size based on length (68px → 56px for longer strings)
- Define theme constants (BG, FG, PRIMARY, MUTED) from the app's oklch palette
- Add `docs/` — Next.js 15 app powered by Fumadocs with a landing page, docs layout, search, OG image generation, and LLM text routes
- Cover getting started, configuration, integrations (Plex, Emby, Jellyfin, Radarr, Sonarr), mobile app setup, and telemetry in MDX
- Exclude `docs/` from root Biome config since it has its own `biome.json`
jake