feat: 服务端 promotion 视频自动转码；首页宣传册预览与 mp4 配置

Made-with: Cursor

scripts/transcode-promotion-videos.ps1

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+# 将 web\promotion\social 下产品视频从 .mov 转为网页通用 .mp4（H.264 + AAC，faststart）
+# 依赖：已安装 ffmpeg 并在 PATH 中（Windows: https://www.gyan.dev/ffmpeg/builds/ 或 winget install ffmpeg）
+
+$ErrorActionPreference = "Stop"
+$Root = Split-Path -Parent $PSScriptRoot
+$Dir = Join-Path $Root "web\promotion\social"
+
+$ffmpeg = Get-Command ffmpeg -ErrorAction SilentlyContinue
+if (-not $ffmpeg) {
+    Write-Host "未找到 ffmpeg。请安装并加入 PATH：https://ffmpeg.org/download.html" -ForegroundColor Red
+    exit 1
+}
+
+$files = @(
+    "video-calc-demo-1.mov",
+    "video-calc-demo-2.mov",
+    "video-aiword.mov",
+    "video-voice-office.mov",
+    "video-invoice-ai.mov"
+)
+
+foreach ($f in $files) {
+    $src = Join-Path $Dir $f
+    $base = [System.IO.Path]::GetFileNameWithoutExtension($f)
+    $dst = Join-Path $Dir "$base.mp4"
+    if (-not (Test-Path -LiteralPath $src)) {
+        Write-Host "[跳过] 无源文件: $src" -ForegroundColor Yellow
+        continue
+    }
+    Write-Host "[转码] $src -> $dst"
+    & ffmpeg -y -i $src `
+        -c:v libx264 -profile:v high -pix_fmt yuv420p `
+        -c:a aac -b:a 128k `
+        -movflags +faststart `
+        $dst
+    if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }
+    Write-Host "[完成] $dst" -ForegroundColor Green
+}
+
+Write-Host "全部处理结束。请部署生成的 .mp4；确认后可删除本地 .mov（可选）。" -ForegroundColor Cyan