feat: 统一后台与用户端图片与文件上传交互，支持点击放大预览、删除与多图批量多选上传

docs/test-evidence/round-2/test-btp-08.ps1

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+# BTP-08 出海博客与 OpenGraph 社交卡片端到端测试自动化脚本
+$session = "btp08"
+$evidenceDir = "docs/test-evidence/round-2"
+$screenshotPath = "$evidenceDir/btp-08-articles.png"
+
+Write-Host "[1/7] 正在打开登录页面..."
+agent-browser --session $session open "http://localhost:5173/login"
+agent-browser --session $session wait 2000
+
+Write-Host "[2/7] 正在执行登录 (admin / admin)..."
+agent-browser --session $session click "button.arco-btn-primary"
+agent-browser --session $session wait 2500
+
+Write-Host "[3/7] 导航至出海博客文章管理页面..."
+agent-browser --session $session open "http://localhost:5173/card/articles"
+agent-browser --session $session wait 3000
+
+Write-Host "[4/7] 检查文章列表页面 DOM 快照..."
+$listSnapshot = agent-browser --session $session snapshot -i
+Write-Host $listSnapshot
+
+Write-Host "[5/7] 点击'新建文章'按钮并等待抽屉弹出..."
+agent-browser --session $session click "button.arco-btn-primary"
+agent-browser --session $session wait 2000
+
+Write-Host "[6/7] 验证表单输入并联动测试 OpenGraph 预览..."
+# 填入测试标题、摘要、封面图
+agent-browser --session $session fill "input[placeholder*='出海深度']" "2026 Global AI Digital Card Whitepaper"
+agent-browser --session $session fill "textarea[placeholder*='摘要']" "Comprehensive analysis on next-generation NFC and AI-driven business card technology for cross-border enterprise."
+agent-browser --session $session fill "input[placeholder*='cover.jpg']" "https://images.unsplash.com/photo-1519389950473-47ba0277781c?w=600"
+agent-browser --session $session wait 1500
+
+$drawerSnapshot = agent-browser --session $session snapshot -i
+Write-Host "[Drawer & OpenGraph Snapshot]:"
+Write-Host $drawerSnapshot
+
+Write-Host "[7/7] 保存完整截图凭证到 $screenshotPath..."
+agent-browser --session $session screenshot $screenshotPath
+
+Write-Host "BTP-08 端到端测试执行完毕！"