v0.3.20: 每日汇报系统 — 每天8点自动收集前一日数据并推送汇总报告

新增:
- src/services/daily-report.service.ts (核心服务: 数据收集/报告生成/格式化/调度器)
- API: GET/PUT daily-report/config, GET daily-report/preview, POST daily-report/test, GET daily-report/last-run
- 前端: 侧边栏"📊 每日汇报"菜单 + SystemConfig.vue 配置面板(时间/内容开关/预览/测试发送)
- main.ts: 每60秒检查调度, 08:00-08:04 窗口内运行

报告内容: 搜索统计/转存统计(成功率)/各网盘容量和活跃状态/用户数

source_clean/frontend-src/dist-vite/assets/AdminLayout-K9Kq5pc4.css

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