feat: 转存记录记录文件大小, 详情展示使用账号+文件大小+时间格式

- quark/baidu 驱动 saveFromShare 返回 fileSize 总大小
- cloud.service.ts 写入 file_size 字段（非null时转字符串）
- 详情页新增文件大小展示（formatFileSize 自动格式化）
- 详情页时间改为 formatTime(yyyy-MM-dd HH:mm:ss)
- SaveRecords 时间格式: 05-15 → 2026-05-15

packages/backend/src/cloud/cloud.service.ts

@@ -155,7 +155,7 @@ async function doSaveFromShare(shareUrl: string, cloudType: string, sourceTitle?
   const startTime = Date.now();
 
   try {
-    let driverResult: { success: boolean; message: string; shareUrl?: string; sharePwd?: string; folderName?: string; fileCount?: number; folderCount?: number; originalFolderName?: string };
+    let driverResult: { success: boolean; message: string; shareUrl?: string; sharePwd?: string; folderName?: string; fileCount?: number; folderCount?: number; fileSize?: number; originalFolderName?: string };
 
     switch (cloudType) {
       case 'quark': {
@@ -194,7 +194,7 @@ async function doSaveFromShare(shareUrl: string, cloudType: string, sourceTitle?
     ).run(
       cloudType, sourceTitle || driverResult.folderName || null, shareUrl, cloudType,
       driverResult.shareUrl || null, driverResult.sharePwd || null,
-      null, driverResult.fileCount || 0, driverResult.folderCount || 0,
+      driverResult.fileSize == null ? null : String(driverResult.fileSize), driverResult.fileCount || 0, driverResult.folderCount || 0,
       durationMs, driverResult.success ? 'success' : 'failed',
       driverResult.success ? null : driverResult.message,
       driverResult.folderName || null, driverResult.originalFolderName || null,