refactor: 企业级目录重构与播放/关于页体验升级

- 按 app / shared / entities / features 分层，路由懒加载并抽出布局组件
- 请求层改为可插拔拦截器，统一错误类型、超时取消与端点拆分
- 抽取播放器、骨架屏、网格等复用组件，点赞收藏接入统一交互反馈
- 关于页重做为无边框极光风格，补充 iOS / Google Play 下载入口
- 修复播放页滚轮切集吞事件、页面误滚动、后台持续播放与声音记忆问题
- 语言按本地偏好与 IP 识别，国旗改为内联 SVG
- 清理未使用的旧站点文件，补充 ESLint 配置

src/shared/lib/media.js

@@ -0,0 +1,18 @@
+// Author: fruit.com.cn
+export const FALLBACK_IMAGE = '/assets/hero.jpg';
+const MEDIA_BASE_URL = (import.meta.env.VITE_MEDIA_BASE_URL || '').replace(/\/$/, '');
+
+export const resolveMedia = (value) => {
+  if (!value) return FALLBACK_IMAGE;
+  return /^https?:\/\//.test(value) ? value : `${MEDIA_BASE_URL}${value}`;
+};
+
+export const resolvePlaybackUrl = resolveMedia;
+
+export const getImage = (item = {}) => resolveMedia(item.coverLandscape || item.coverUrl || item.cover || item.posterUrl || item.imageUrl);
+
+export function selectPlaybackUrl(playback, fallback = '') {
+  const tracks = playback?.tracks || [];
+  const preferred = tracks.find((track) => track.quality === '360p') || tracks.find((track) => track.quality === 'AUTO') || tracks[0];
+  return resolveMedia(preferred?.playUrl || playback?.playUrl || fallback);
+}