二维码池批量上传与认证图片预览修复

- 后端新增批量创建二维码接口 POST /admin/chats/qrcodes/batch
- 前端二维码管理页支持多图拖拽批量上传
- 注册 qrcode 图片压缩场景(maxSide=2560, quality=0.95)
- 后端 normalizeScene 注册 qrcode scene
- 增强 AuthImage 组件支持 el-image 大图预览(previewSrcList)
- 修复 WithdrawalDetailDialog 提现凭证图片 401 问题
- 删除重复的 components/AuthImage.vue，统一使用共享组件
- 提交3剩余: 会话列表群类型图标、发布成功跳群、管理端路由等

frontend/src/shared/utils/imageUpload.ts

@@ -7,6 +7,7 @@ const IMAGE_UPLOAD_MAX_SIDE: Record<string, number> = {
   dispute: 1920,
   handoff: 1920,
   realname: 1920,
+  qrcode: 2560,
 }
 
 const IMAGE_UPLOAD_QUALITY: Record<string, number> = {
@@ -18,6 +19,7 @@ const IMAGE_UPLOAD_QUALITY: Record<string, number> = {
   dispute: 0.86,
   handoff: 0.86,
   realname: 0.86,
+  qrcode: 0.95,
 }
 
 export async function optimizeImageForUpload(file: File, scene: string) {
@@ -25,10 +27,11 @@ export async function optimizeImageForUpload(file: File, scene: string) {
   if (!['image/jpeg', 'image/png', 'image/webp'].includes(file.type)) return file
   if (typeof document === 'undefined') return file
 
+  const maxSide = IMAGE_UPLOAD_MAX_SIDE[scene] ?? 1600
+  const quality = IMAGE_UPLOAD_QUALITY[scene] ?? 0.82
+
   try {
     const image = await loadImage(file)
-    const maxSide = IMAGE_UPLOAD_MAX_SIDE[scene] || 1600
-    const quality = IMAGE_UPLOAD_QUALITY[scene] || 0.82
     const { width, height } = fitSize(image.naturalWidth, image.naturalHeight, maxSide)
     const canvas = document.createElement('canvas')
     canvas.width = width