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/indexnow-ping.ps1

@@ -0,0 +1,51 @@
+# Paca 사이트(site/)의 전체 URL 을 IndexNow 로 검색엔진(Bing/ChatGPT Search·Naver·Yandex)에 즉시 통보한다.
+# 사용: ./build/indexnow-ping.ps1 [-SiteUrl https://mediabrowser.chanpaca.net]
+# 필요: site/sitemap.xml, site/{key}.txt  (키 파일은 사이트 루트에서 공개 접근 가능해야 한다)
+# 참고: ChatGPT Search 인용의 87%가 Bing 인덱스에서 나오므로 IndexNow 즉시 색인은 최우선 순위 채널이다.
+param([string]$SiteUrl = "https://mediabrowser.chanpaca.net")
+
+$ErrorActionPreference = "Stop"
+$root = Split-Path -Parent $PSScriptRoot
+$key = "e9f2c7a4b1d8460f9c3e2a7b5d1f08c4"
+$keyLocation = "$SiteUrl/$key.txt"
+$sitemapPath = Join-Path $root "site\sitemap.xml"
+
+if (-not (Test-Path $sitemapPath)) { throw "site/sitemap.xml 이 없습니다." }
+
+# 1) sitemap.xml 에서 <loc> URL 전량 추출
+[xml]$sitemap = Get-Content $sitemapPath -Raw
+$urls = @($sitemap.urlset.url | ForEach-Object { $_.loc } | Where-Object { $_ })
+if ($urls.Count -eq 0) { throw "sitemap.xml 에서 URL 을 찾지 못했습니다." }
+Write-Host "IndexNow: $($urls.Count)개 URL 제출" -ForegroundColor Cyan
+
+# 2) 참여 엔진에 배치 제출 (api.indexnow.org 는 참여 엔진에 URL 을 공유한다)
+$endpoints = @(
+    "https://api.indexnow.org/indexnow",
+    "https://www.bing.com/indexnow",
+    "https://searchadvisor.naver.com/indexnow"
+)
+
+$body = @{
+    host        = ([System.Uri]$SiteUrl).Host
+    key         = $key
+    keyLocation = $keyLocation
+    urlList     = $urls
+} | ConvertTo-Json -Depth 3
+
+foreach ($endpoint in $endpoints) {
+    try {
+        $resp = Invoke-WebRequest -Uri $endpoint -Method Post -ContentType "application/json; charset=utf-8" `
+            -Body $body -UseBasicParsing -TimeoutSec 30
+        Write-Host ("  {0} -> {1} {2}" -f $endpoint, [int]$resp.StatusCode, $resp.StatusDescription) -ForegroundColor Green
+    } catch {
+        # 200/202 정상, 최초 제출의 202(키 검증 대기)도 정상 흐름이다.
+        $code = $_.Exception.Response.StatusCode.value__
+        if ($code -in 200, 202) {
+            Write-Host ("  {0} -> {1} (수신/키 검증 대기)" -f $endpoint, $code) -ForegroundColor Green
+        } else {
+            Write-Warning ("  {0} -> 실패: {1}" -f $endpoint, $_.Exception.Message)
+        }
+    }
+}
+
+Write-Host "완료: IndexNow 제출 종료" -ForegroundColor Green