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/frontend/src/pages/admin/SaveRecords.vue

@@ -150,7 +150,7 @@
               </div>
               <div class="detail-cell">
                 <span class="detail-label">时间</span>
-                <code class="detail-code">{{ row.created_at }}</code>
+                <code class="detail-code">{{ formatTime(row.created_at) }}</code>
               </div>
             </div>
             <!-- Row 5: 错误信息（整行） -->
@@ -333,7 +333,7 @@ function formatTime(t: string): string {
   const d = new Date(ts)
   if (isNaN(d.getTime())) return t
   const pad = (n: number) => String(n).padStart(2, '0')
-  return `${pad(d.getMonth() + 1)}-${pad(d.getDate())} ${pad(d.getHours())}:${pad(d.getMinutes())}:${pad(d.getSeconds())}`
+  return `${d.getFullYear()}-${pad(d.getMonth() + 1)}-${pad(d.getDate())} ${pad(d.getHours())}:${pad(d.getMinutes())}:${pad(d.getSeconds())}`
 }
 
 function formatDuration(ms: number): string {