feat(wechat): 支持图集背景音频下载#347
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添加 DownloadHistory 管理器，实现双重去重机制： - 抓取阶段：检查 URL 签名是否在持久化历史中 - 下载阶段：检查目标文件是否已存在 技术实现： - 使用 JSON 文件持久化下载记录到 ~/.config/res-downloader/download_history.json - sync.RWMutex 保证并发安全 - 异步保存避免阻塞下载操作 - 启动时自动加载历史记录 修改文件： - core/resource.go: 添加 DownloadHistory 数据结构和方法 - docs/plans/: 添加实现计划文档 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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微信图集现在会把图片和背景音频一起落到同一条内容目录里，混合导出和直接下载两条链路都能识别并处理，避免只拿到首图或把音频丢掉。\n\n## 变更\n1. 后端补了微信图文/图集的音频字段提取，写入图集元数据。\n2. 图集直接下载会生成 images/ 和可选的 �udio/，并把 metadata.json 一并落盘。\n3. 批量导出到 IDM 的混合包会把图集音频也纳入任务包，BAT 运行时同目录下载。\n4. 增加了对应的 Go 和前端测试，覆盖图集、音频和混合包路径。\n\n## 验证\n- go test ./...\n-
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pm run test:idm-mixed\n-
pm run build\n- wails build\n\n---\n\n