feat(anime): add anime browser powered by Aniyomi extensions

- Add `subminer anime` / `--anime` and a tray entry to open a browser that searches installed Aniyomi extension sources, shows cover art and episodes, and plays into mpv with overlay/mining attached
- Add an Extensions tab to add repos and install/update/remove sources, and per-source settings for sources needing config
- Support searching all sources at once with streaming, per-source results and status
- Prefer Japanese audio/subtitle tracks from the source and keep the primary subtitle slot reserved for Japanese
- Fix window/tray/Dock handling so the browser and mpv can be switched between without quitting the app or losing the Dock icon
- Add anime.repos, anime.extensionsDir, anime.preferredQuality config keys (no bundled repos or discovery)

docs-site/.vitepress/config.ts

@@ -327,6 +327,7 @@ const sidebar: DefaultTheme.SidebarItem[] = [
       { text: 'Anki', link: '/anki-integration' },
       { text: 'Jellyfin', link: '/jellyfin-integration' },
       { text: 'YouTube', link: '/youtube-integration' },
+      { text: 'Anime Browser', link: '/anime-browser' },
       { text: 'Jimaku', link: '/jimaku-integration' },
       { text: 'TsukiHime', link: '/tsukihime-integration' },
       { text: 'AniList', link: '/anilist-integration' },