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/distribution/chocolatey/paca.nuspec

@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Paca — Chocolatey package spec (v1.2.0). 자리표시자는 릴리스 확정 후 채운다. -->
+<package xmlns="http://schemas.microsoft.com/packaging/2015/06/nuspec.xsd">
+  <metadata>
+    <id>paca</id>
+    <version>1.2.0</version>
+    <title>Paca</title>
+    <authors>Paca</authors>
+    <owners>Paca</owners>
+    <projectUrl>https://mediabrowser.chanpaca.net/</projectUrl>
+    <packageSourceUrl>https://git.chanpaca.net/Video-Downloader/releases</packageSourceUrl>
+    <iconUrl>https://mediabrowser.chanpaca.net/assets/paca-logo-512.png</iconUrl>
+    <licenseUrl>https://mediabrowser.chanpaca.net/</licenseUrl>
+    <requireLicenseAcceptance>false</requireLicenseAcceptance>
+    <projectSourceUrl>https://git.chanpaca.net/Video-Downloader/releases</projectSourceUrl>
+    <docsUrl>https://mediabrowser.chanpaca.net/guide.html</docsUrl>
+    <releaseNotes>https://mediabrowser.chanpaca.net/releases.html</releaseNotes>
+    <summary>Free media browser and video downloader (HLS m3u8 / DASH / MP4 auto-detection).</summary>
+    <description>
+Paca is a 100% free media browser for Windows that downloads streaming video.
+It detects HLS (.m3u8), MPEG-DASH (.mpd) and MP4 streams the moment they play,
+inherits the tab's login cookies and Referer header, downloads segments in
+parallel with resume, and remuxes them into a lossless MP4 with a built-in
+ffmpeg engine. Free alternative to Internet Download Manager and 4K Video
+Downloader, with no download cap and no subscription.
+
+This package installs the desktop application. A separate Android companion app
+is distributed via APK.
+    </description>
+    <tags>video-downloader m3u8 hls dash download-manager media-browser ffmpeg</tags>
+  </metadata>
+  <files>
+    <file src="tools\**" target="tools" />
+  </files>
+</package>

build/distribution/chocolatey/tools/chocolateyInstall.ps1

@@ -0,0 +1,18 @@
+# Paca Chocolatey install script. SHA256 은 공개 릴리스 자산 v1.2.0 에서 산출했다.
+$ErrorActionPreference = 'Stop'
+
+$toolsDir = Split-Path -Parent $MyInvocation.MyCommand.Definition
+$version  = '1.2.0'
+$base     = "https://git.chanpaca.net/Video-Downloader/releases/releases/download/v$version"
+
+$packageArgs = @{
+  packageName    = 'paca'
+  fileType       = 'msi'
+  url64bit       = "$base/Paca-Setup-x64.msi"
+  checksum64     = '56f305290656e636360bcf70377f3b83327149a3ae925f8350d90402f8ed43e3'
+  checksumType64 = 'sha256'
+  silentArgs     = '/qn /norestart'
+  validExitCodes = @(0, 3010, 1641)
+}
+
+Install-ChocolateyPackage @packageArgs

build/distribution/chocolatey/tools/chocolateyUninstall.ps1

@@ -0,0 +1,23 @@
+# Paca — Chocolatey uninstall script (silent MSI uninstall by name/ProductCode).
+$ErrorActionPreference = 'Stop'
+
+$packageName = 'paca'
+$softwareName = 'Paca'
+
+[array]$key = Get-UninstallRegistryKey -SoftwareName $softwareName
+
+if ($key.Count -eq 1) {
+  $key | ForEach-Object {
+    $msiArgs = @(
+      '/x'
+      $_.PSChildName
+      '/qn'
+      '/norestart'
+    )
+    Uninstall-ChocolateyPackage -PackageName $packageName -FileType 'msi' -SilentArgs ($msiArgs -join ' ') -ValidExitCodes @(0, 3010, 1605, 1614, 1641)
+  }
+} elseif ($key.Count -eq 0) {
+  Write-Warning "$packageName has already been uninstalled by other means."
+} else {
+  Write-Warning "Multiple matching products found. Please uninstall manually."
+}