feat: 架构重构与跨平台媒体控制集成

## 后端

- 替换 rodio 为 symphonia + ringbuf，重构 audio.rs 播放引擎
- 重构 api.rs，使用 api_call! 宏统一 API 调用模式
- 新增 media_controls.rs，使用 souvlaki 实现跨平台系统媒体控制
  (Linux MPRIS / Windows SMTC / macOS Now Playing)
- 版本号升至 v0.5.0

## 前端 - 新增

- 新增 SongListItem 通用组件
- 新增 useOnlineStatus composable，检测网络状态
- 新增 usePageCache composable，页面数据缓存与失效
- 新增 getCoverUrl()、formatDate() 工具函数
- 新增 emitPlaybackState() 同步播放状态到系统媒体控制
- 新增 mpris-command 事件监听，响应系统媒体控制命令
- 新增 Toast 离线/恢复在线提示
- 各页面新增断网恢复后自动重试加载
- 新增路由守卫：已登录用户访问 /login 重定向至首页
- 新增音量持久化（settings store + localStorage）
- 新增禁用右键菜单与用户选择限制（输入框除外）

## 前端 - 变更

- Song 接口从 player.ts 迁移至 song.ts 并导出
- AlbumDetail/ArtistDetail/PlaylistDetail/RecentPlays/LocalMusic 迁移至 SongListItem
- PlayerBar 队列列表迁移至 SongListItem，封面使用 getCoverUrl()
- downloadSong 参数类型从内联对象改为 Song，使用 getCoverUrl()
- 默认主题从 green 改为 blue，ThemeName 及相关列表中 blue 移至首位
- 全局快捷键从 Alt+Control 改为 Control+Alt 顺序
- formatShortcut 新增 KeyP → P 显示
- keep-alive 从 max=3 固定 include 改为 max=5 动态列表，窗口隐藏时释放
- App.vue 封面使用 getCoverUrl() 替代手动 al/album 回退
- formatPlayCount 提取常量
- Login.vue text-warning 改为 text-yellow-400

## 前端 - 删除

- 删除 Search.vue（与 Discover.vue 重复）
- 删除 SongItemMenu.vue（被 SongListItem 替代）

## 修复

- 更新器跳过版本逻辑：仅静默检查时跳过已忽略版本，手动检查不再跳过
- 重复播放同一首歌时无法恢复播放
- settings.ts 重复的 ThemeName 定义
- PlayerBar.vue modeTexts 缺少类型注解
- Home.vue map 回调参数缺少类型
- Settings.vue v-for key 类型不匹配

src/views/RecentPlays.vue

@@ -6,51 +6,44 @@
     <h1 class="text-2xl font-bold mb-6">最近播放</h1>
     <div v-if="player.recentLocal.length === 0" class="text-content-3">还没有播放记录，去听首歌吧</div>
     <div v-else class="space-y-2">
-      <div
+      <SongListItem
         v-for="(song, index) in player.recentLocal"
         :key="song.id"
+        :song="song"
+        :index="index"
+        :is-current="player.currentSong?.id === song.id"
+        show-index
+        show-like
+        show-download
+        show-menu
+        show-duration
+        show-playing-overlay
+        :container-class="player.currentSong?.id === song.id ? 'bg-accent-dim hover:bg-accent-dim' : 'hover:bg-subtle'"
         @click="player.playFromList(player.recentLocal, index)"
-        class="flex items-center gap-4 p-3 rounded-xl hover:bg-subtle transition cursor-pointer"
       >
-        <span class="text-xs text-content-3 w-6 text-right">{{ index + 1 }}</span>
-        <img :src="song.al?.picUrl" class="w-10 h-10 rounded object-cover" />
-        <div class="flex-1 min-w-0">
-          <p class="text-sm font-medium truncate">{{ song.name }}</p>
-          <p class="text-xs text-content-2 truncate">
-            <template v-for="(a, i) in song.ar || []" :key="a.id || i">
-              <span v-if="i > 0" class="text-content-3">/</span>
-              <span class="hover:text-accent-text cursor-pointer transition" @click.stop="a.id && router.push({ name: 'artist', params: { id: a.id } })">{{ a.name }}</span>
+        <template #index="{ index: idx, isCurrent }">
+          <div class="w-6 text-right flex-shrink-0 flex items-center justify-end h-5">
+            <div v-if="isCurrent" class="flex items-center justify-end">
+              <div class="flex items-center gap-[3px] h-4">
+                <span class="w-[3px] bg-accent-text rounded-full animate-bounce" style="height: 50%; animation-delay: 0ms"></span>
+                <span class="w-[3px] bg-accent-text rounded-full animate-bounce" style="height: 100%; animation-delay: 150ms"></span>
+                <span class="w-[3px] bg-accent-text rounded-full animate-bounce" style="height: 35%; animation-delay: 300ms"></span>
+              </div>
+            </div>
+            <template v-else>
+              <span class="text-xs text-content-3 group-hover:hidden">{{ idx + 1 }}</span>
+              <svg class="hidden group-hover:block text-content" width="14" height="14" viewBox="0 0 16 16" fill="currentColor"><path d="M4 2.5v11l9-5.5z"/></svg>
             </template>
-            <template v-if="song.al?.name">
-              <span class="text-content-3 mx-1">·</span>
-              <span class="hover:text-accent-text cursor-pointer transition" @click.stop="song.al.id && router.push({ name: 'album', params: { id: song.al.id } })">{{ song.al.name }}</span>
-            </template>
-          </p>
-        </div>
-        <button @click.stop="player.toggleLike(song.id)" class="text-content-3 hover:text-danger transition flex-shrink-0">
-          <svg v-if="player.isLiked(song.id)" width="16" height="16" viewBox="0 0 24 24" fill="currentColor" class="text-danger"><path d="M20.84 4.61a5.5 5.5 0 00-7.78 0L12 5.67l-1.06-1.06a5.5 5.5 0 00-7.78 7.78l1.06 1.06L12 21.23l7.78-7.78 1.06-1.06a5.5 5.5 0 000-7.78z"/></svg>
-          <svg v-else width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M20.84 4.61a5.5 5.5 0 00-7.78 0L12 5.67l-1.06-1.06a5.5 5.5 0 00-7.78 7.78l1.06 1.06L12 21.23l7.78-7.78 1.06-1.06a5.5 5.5 0 000-7.78z"/></svg>
-        </button>
-        <button @click.stop="download.downloadSong(song)" class="text-content-3 hover:text-accent-text transition flex-shrink-0" :title="download.isDownloaded(song.id) ? '已下载' : '下载'">
-          <svg v-if="download.isDownloading(song.id)" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="animate-spin"><path d="M21 12a9 9 0 11-6.22-8.56"/></svg>
-          <svg v-else-if="download.isDownloaded(song.id)" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="text-accent-text"><polyline points="20 6 9 17 4 12"/></svg>
-          <svg v-else width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M21 15v4a2 2 0 01-2 2H5a2 2 0 01-2-2v-4"/><polyline points="7 10 12 15 17 10"/><line x1="12" y1="15" x2="12" y2="3"/></svg>
-        </button>
-        <SongItemMenu :song-id="song.id" />
-        <span class="text-xs text-content-3">{{ formatDuration(song.dt ?? 0) }}</span>
-      </div>
+          </div>
+        </template>
+      </SongListItem>
     </div>
   </div>
 </template>
 
 <script setup lang="ts">
 import { usePlayerStore } from '../stores/player';
-import { useDownload } from '../composables/useDownload';
-import { formatDuration } from '../utils/format';
-import { useRouter } from 'vue-router';
-import SongItemMenu from '../components/SongItemMenu.vue';
+import SongListItem from '../components/SongListItem.vue';
 
 const player = usePlayerStore();
-const download = useDownload();
-const router = useRouter();
 </script>