feat: add pcf analysis web app and api

scripts/install_offline.ps1

@@ -0,0 +1,19 @@
+$ErrorActionPreference = "Stop"
+$Root = Split-Path -Parent $PSScriptRoot
+$Venv = Join-Path $Root ".venv"
+$Python = "python"
+
+if (-not (Test-Path $Venv)) {
+  & $Python -m venv $Venv
+}
+
+$VenvPython = Join-Path $Venv "Scripts\python.exe"
+$WheelDir = Join-Path $Root "vendor\wheels"
+$Req = Join-Path $Root "requirements.txt"
+
+if (-not (Test-Path $WheelDir)) {
+  throw "未找到离线依赖目录：$WheelDir。请先在联网环境运行 scripts\download_wheels.ps1。"
+}
+
+& $VenvPython -m pip install --no-index --find-links $WheelDir -r $Req
+Write-Host "安装完成。运行 scripts\run.ps1 启动服务。"