feat(growth): ship search registration, long-tail SEO and in-app sharing

Register both Paca domains on Naver Search Advisor, Google Search Console and
Bing Webmaster Tools so the site can be indexed by every major engine, add
DASH and AES-128 how-to pages to capture protocol-specific searches, and let a
finished download share a UTM-tagged landing link from the completion shelf.
Package-manager manifests (winget, Chocolatey, Scoop) now carry verified
v1.2.0 hashes and product codes instead of placeholders. All 2,757 tests pass.

💘 Generated with Crush

Assisted-by: Crush:deepseek-v4.1-flash

build/deploy-site.ps1

@@ -28,3 +28,7 @@ npx wrangler pages deploy (Join-Path $root "site") --project-name $Project --bra
 if ($LASTEXITCODE -ne 0) { throw "wrangler 배포 실패" }
 
 Write-Host "완료: https://$Project-7r4.pages.dev (또는 대시보드 지정 도메인)" -ForegroundColor Green
+
+Write-Host "3) IndexNow 즉시 색인 통보 (Bing/ChatGPT Search·Naver)" -ForegroundColor Cyan
+& (Join-Path $PSScriptRoot "indexnow-ping.ps1")
+if ($LASTEXITCODE -ne 0) { Write-Warning "IndexNow 제출 실패 (배포 자체는 성공, 추후 재실행 가능)" }