fix: add uninstall.ps1, restore privacy.html and terms.html

- uninstall.ps1: Windows one-click uninstall script (was 404)
- privacy.html & terms.html: restore from server (were missing on Vercel)

website/uninstall.ps1

@@ -0,0 +1,69 @@
+# ============================================================
+# U-Claw 一键卸载 (Windows PowerShell)
+# Usage: irm https://u-claw.org/uninstall.ps1 | iex
+# ============================================================
+
+$ErrorActionPreference = "SilentlyContinue"
+$UclawDir = "$env:USERPROFILE\.uclaw"
+$AgentDir = "$env:TEMP\uclaw"
+
+Write-Host ""
+Write-Host "  ==========================================" -ForegroundColor Cyan
+Write-Host "    U-Claw 一键卸载" -ForegroundColor Cyan
+Write-Host "  ==========================================" -ForegroundColor Cyan
+Write-Host ""
+
+# 1. Stop OpenClaw / Node processes in .uclaw
+$nodeProcs = Get-Process -Name "node" -ErrorAction SilentlyContinue | Where-Object {
+    $_.Path -like "*\.uclaw\*"
+}
+if ($nodeProcs) {
+    Write-Host "  [1/3] 停止 OpenClaw 进程..." -ForegroundColor Yellow
+    $nodeProcs | Stop-Process -Force -ErrorAction SilentlyContinue
+    Start-Sleep -Seconds 1
+    Write-Host "  [OK] 已停止" -ForegroundColor Green
+} else {
+    Write-Host "  [1/3] OpenClaw 未在运行" -ForegroundColor Gray
+}
+
+# 2. Stop Agent
+$agentProcs = Get-Process -Name "agent" -ErrorAction SilentlyContinue | Where-Object {
+    $_.Path -like "*uclaw*"
+}
+if ($agentProcs) {
+    Write-Host "  [2/3] 停止 Agent 进程..." -ForegroundColor Yellow
+    $agentProcs | Stop-Process -Force -ErrorAction SilentlyContinue
+    Start-Sleep -Seconds 1
+    Write-Host "  [OK] 已停止" -ForegroundColor Green
+} else {
+    Write-Host "  [2/3] Agent 未在运行" -ForegroundColor Gray
+}
+
+# 3. Remove files
+Write-Host "  [3/3] 清理文件..." -ForegroundColor Yellow
+$removed = $false
+
+if (Test-Path $UclawDir) {
+    Remove-Item -Recurse -Force $UclawDir -ErrorAction SilentlyContinue
+    Write-Host "  [OK] 已删除 $UclawDir" -ForegroundColor Green
+    $removed = $true
+}
+
+if (Test-Path $AgentDir) {
+    Remove-Item -Recurse -Force $AgentDir -ErrorAction SilentlyContinue
+    Write-Host "  [OK] 已删除 $AgentDir" -ForegroundColor Green
+    $removed = $true
+}
+
+if (-not $removed) {
+    Write-Host "  [OK] 没有找到需要清理的文件" -ForegroundColor Gray
+}
+
+Write-Host ""
+Write-Host "  ==========================================" -ForegroundColor Cyan
+Write-Host "    卸载完成！已彻底清理。" -ForegroundColor Green
+Write-Host "  ==========================================" -ForegroundColor Cyan
+Write-Host ""
+Write-Host "  想重装？运行：" -ForegroundColor Gray
+Write-Host "  irm https://u-claw.org/install.ps1 | iex" -ForegroundColor White
+Write-Host ""