feat: v0.3.0 - 流式播放、本地音乐、下载系统、漫游修复

### 新功能
- 流式播放：边下载边播放，缓冲 64KB 后即刻开始，无需等待完整下载
- 本地音乐页面：支持浏览、播放本地歌曲，横向菜单含「从磁盘删除」
- 下载系统：支持下载歌曲到自定义路径，保存完整元数据（封面/专辑/时长）
- 封面补全：本地音乐缺少封面时自动从网易云 API 获取
- 更新信息：接入 Gitea Releases API，查看最新版更新日志

### 修复
- 修复私人漫游播完一首歌后跳三首的问题（双重触发：audio-ended + startTick）
- 修复全屏漫游抽屉和漫游页面无封面歌曲显示破损图片
- 修复 PlayerBar 无封面歌曲显示破损图片
- 修复下载路径修改后不生效（Rust serde camelCase 映射）
- 修复本地音乐始终只显示默认路径歌曲
- 修复下载完成提示弹出 4 次
- 修复播放网络歌曲时进度条先走但无声音（audio-started 事件同步）

### 优化
- PlayerBar 下载状态：未下载显示下载按钮，下载中显示进度，已下载不显示
- audio.rs 新增 manual_stop 标志防止 stop_audio 触发虚假 audio-ended
- player.ts 新增 waitForAudioStart() 确保 playing 状态与实际播放同步
- 切歌/停止时立即清除 tickInterval 防止重复触发 next()

src/stores/settings.ts

@@ -19,23 +19,50 @@ export const closeActionLabels: Record<CloseAction, string> = {
   exit: '直接退出',
 };
 
+export interface ShortcutBinding {
+  key: string;
+  label: string;
+}
+
+export const defaultShortcuts: Record<string, ShortcutBinding> = {
+  prev: { key: 'Control+ArrowLeft', label: '上一首' },
+  next: { key: 'Control+ArrowRight', label: '下一首' },
+  volUp: { key: 'Control+ArrowUp', label: '音量增加' },
+  volDown: { key: 'Control+ArrowDown', label: '音量减小' },
+  globalPrev: { key: 'Alt+Control+ArrowLeft', label: '上一首（全局）' },
+  globalNext: { key: 'Alt+Control+ArrowRight', label: '下一首（全局）' },
+  globalVolUp: { key: 'Alt+Control+ArrowUp', label: '音量增加（全局）' },
+  globalVolDown: { key: 'Alt+Control+ArrowDown', label: '音量减小（全局）' },
+};
+
 interface SettingsData {
   audioQuality: AudioQuality;
   downloadPath: string;
   theme: ThemeMode;
   closeAction: CloseAction;
+  shortcuts: Record<string, ShortcutBinding>;
 }
 
 function loadSettings(): SettingsData {
   try {
     const raw = localStorage.getItem('app_settings');
-    if (raw) return JSON.parse(raw);
+    if (raw) {
+      const parsed = JSON.parse(raw);
+      return {
+        audioQuality: parsed.audioQuality || 'standard',
+        downloadPath: parsed.downloadPath || '',
+        theme: parsed.theme || 'dark',
+        closeAction: parsed.closeAction || 'ask',
+        shortcuts: { ...defaultShortcuts, ...(parsed.shortcuts || {}) },
+      };
+    }
   } catch {}
   return {
     audioQuality: 'standard',
     downloadPath: '',
     theme: 'dark',
     closeAction: 'ask',
+    shortcuts: { ...defaultShortcuts },
   };
 }
 
@@ -46,6 +73,7 @@ export const useSettingsStore = defineStore('settings', () => {
   const downloadPath = ref<string>(saved.downloadPath);
   const theme = ref<ThemeMode>(saved.theme);
   const closeAction = ref<CloseAction>(saved.closeAction || 'ask');
+  const shortcuts = ref<Record<string, ShortcutBinding>>(saved.shortcuts);
 
   function setAudioQuality(q: AudioQuality) {
     audioQuality.value = q;
@@ -63,12 +91,29 @@ export const useSettingsStore = defineStore('settings', () => {
     closeAction.value = a;
   }
 
-  watch([audioQuality, downloadPath, theme, closeAction], () => {
+  function setShortcut(id: string, key: string) {
+    shortcuts.value = { ...shortcuts.value, [id]: { ...shortcuts.value[id], key } };
+  }
+
+  function resetShortcuts() {
+    shortcuts.value = { ...defaultShortcuts };
+  }
+
+  function resetAll() {
+    audioQuality.value = 'standard';
+    downloadPath.value = '';
+    theme.value = 'dark';
+    closeAction.value = 'ask';
+    shortcuts.value = { ...defaultShortcuts };
+  }
+
+  watch([audioQuality, downloadPath, theme, closeAction, shortcuts], () => {
     const data: SettingsData = {
       audioQuality: audioQuality.value,
       downloadPath: downloadPath.value,
       theme: theme.value,
       closeAction: closeAction.value,
+      shortcuts: shortcuts.value,
     };
     localStorage.setItem('app_settings', JSON.stringify(data));
   }, { deep: true });
@@ -78,9 +123,13 @@ export const useSettingsStore = defineStore('settings', () => {
     downloadPath,
     theme,
     closeAction,
+    shortcuts,
     setAudioQuality,
     setDownloadPath,
     setTheme,
     setCloseAction,
+    setShortcut,
+    resetShortcuts,
+    resetAll,
   };
 });