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/public/config.example.jsonc

@@ -611,6 +611,18 @@
     } // Lapis kiku setting.
   }, // Automatic Anki updates and media generation options.
 
+  // ==========================================
+  // Anime Browser
+  // 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.
+  // Hot-reload: anime changes apply the next time the anime browser opens.
+  // ==========================================
+  "anime": {
+    "extensionsDir": "", // Directory holding Aniyomi extension .apk files. Empty uses <userData>/anime-extensions.
+    "repos": [], // Extension repository index URLs (any https .json index, e.g. https://.../index.min.json). Empty by default; SubMiner ships no repositories.
+    "preferredQuality": "" // Preferred stream quality label, matched as a substring (for example: 1080). Empty uses the source order.
+  }, // Anime browser sources. SubMiner ships no extension repositories and bundles no sources;
+
   // ==========================================
   // Jimaku
   // Jimaku API configuration and defaults.