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)

src/config/definitions/template-sections.ts

@@ -141,6 +141,15 @@ const INTEGRATION_TEMPLATE_SECTIONS: ConfigTemplateSection[] = [
     ],
     key: 'ankiConnect',
   },
+  {
+    title: 'Anime Browser',
+    description: [
+      'Anime browser sources. SubMiner ships no extension repositories and bundles no sources;',
+      'add a repository index URL here (or drop .apk files in the extensions directory) to have any.',
+    ],
+    notes: ['Hot-reload: anime changes apply the next time the anime browser opens.'],
+    key: 'anime',
+  },
   {
     title: 'Jimaku',
     description: ['Jimaku API configuration and defaults.'],