fix: backup_registry 调用加 await，避免与 save 竞态导致备份到新值

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/store/app-store.ts

@@ -260,7 +260,7 @@ export const useAppStore = create<AppState>((set, get) => ({
     }
 
     // 备份当前注册表（保存前备份旧值，失败仅警告不中断）
-    invoke('backup_registry', { customDir: null })
+    await invoke('backup_registry', { customDir: null })
       .catch(() => set({ statusMessage: i18n.t('status.warning_backup') }));
 
     const [sysResult, userResult] = await Promise.allSettled([