refactor(playHistory): v1 旧 localStorage key 清理与调用方对齐

老用户升级后清掉 v1 时代独立 key 释放配额，调用方切到 store API。

- player.ts initializePlayState 调用从 migrateFromLocalStorage 切到
  cleanupLegacyPlayHistoryStorage：不再做数据迁移（历史是低关键性
  衍生数据，老用户重新听几次即可），仅清掉旧 musicHistory/podcastHistory/
  playlistHistory/albumHistory/podcastRadioHistory/playHistory-migrated/
  playMode 这 7 个旧 key，避免和新 play-history-store key 双倍占用
- SystemTab.vue 清缓存的 case 'history' 改走 usePlayHistoryStore().
  clearMusicHistory()，与 v1 时代行为对齐（只清音乐历史，不动 podcast/
  playlist/album/podcastRadio）；移除 case 'settings' 里的
  removeItem('playMode')——已并入 player-core-store

src/renderer/store/modules/player.ts

@@ -13,7 +13,7 @@ import { computed } from 'vue';
 import { useFavoriteStore } from './favorite';
 import { useIntelligenceModeStore } from './intelligenceMode';
 import { usePlayerCoreStore } from './playerCore';
-import { usePlayHistoryStore } from './playHistory';
+import { cleanupLegacyPlayHistoryStorage } from './playHistory';
 import { usePlaylistStore } from './playlist';
 import { type SleepTimerInfo, SleepTimerType, useSleepTimerStore } from './sleepTimer';
 
@@ -72,9 +72,8 @@ export const usePlayerStore = defineStore('player', () => {
    * 初始化播放状态（从 localStorage 恢复）
    */
   const initializePlayState = async () => {
-    // 从旧的 localStorage 迁移播放记录到 Pinia store
-    const playHistoryStore = usePlayHistoryStore();
-    playHistoryStore.migrateFromLocalStorage();
+    // 一次性清理 v1 时代的旧 localStorage key，不做数据迁移（详见 playHistory.ts 注释）
+    cleanupLegacyPlayHistoryStorage();
 
     const { initializePlayState: initPlayState } = await import('@/services/playbackController');
     await initPlayState();