全量迁移到 Gitea: App更新检查/JS热更新端点上链 Gitea, 文档同步

- AppUpdateManager: releases/latest 改用 gitea.kasugano.cn API
- KtvJsBridge: JS 热更新改用 Gitea raw(/raw/branch/master/...)
- MainActivity/SongApiClient/DatabaseBootstrapper/MuseDbSync: 文案与注释更新
- README.md/README.en.md: 标注本仓库地址(Gitea), 保留上游框架归属链接
- AGENTS.md: 运行时端点迁移状态

README.en.md

@@ -59,6 +59,8 @@
 
 ## Project Notice
 
+> **This repository**: [https://gitea.kasugano.cn/zijunchiang/maidong-ktv](https://gitea.kasugano.cn/zijunchiang/maidong-ktv)
+>
 > **UI/feature framework credit**: [https://gitee.com/yangyachao-X/maidong-ktv](https://gitee.com/yangyachao-X/maidong-ktv)
 >
 > This repository reworks the upstream "Maidong KTV" UI and feature framework, and the core/data layer was
@@ -68,7 +70,7 @@
 Highlights of the reworked data layer:
 
 - **Library**: synced exclusively from the official Muse service
-  (`mconn.cherryonline.cn` `mls-api/v1/sqlite/sync`); Gitee hosts code only, no database files.
+  (`mconn.cherryonline.cn` `mls-api/v1/sqlite/sync`); the code host carries source only, no database files.
 - **Song source**: `w.w345.my` (`i.php` token → `do.php` playback URL) with fixed device identity and
   reproduced signing; ad/mismatched resources (e.g. `wb66.cn/.../719.ts`) are blocked and retried.
 - **JS hot-update**: `app/src/main/assets/mobile/ktv_api.js`, requires the `KTV_BRIDGE_API: 7` marker.