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/winget/Paca.Paca.locale.en-US.yaml

@@ -0,0 +1,35 @@
+# yaml-language-server: $schema=https://aka.ms/winget-manifest.defaultLocale.1.12.0.schema.json
+# Paca — winget default locale manifest (v1.2.0).
+PackageIdentifier: Paca.Paca
+PackageVersion: 1.2.0
+PackageLocale: en-US
+Publisher: Paca
+PublisherUrl: https://mediabrowser.chanpaca.net/
+PublisherSupportUrl: https://mediabrowser.chanpaca.net/guide.html
+PackageName: Paca
+PackageUrl: https://mediabrowser.chanpaca.net/
+License: Proprietary
+LicenseUrl: https://mediabrowser.chanpaca.net/
+Copyright: Copyright (c) 2026 Paca
+ShortDescription: Free media browser and video downloader that auto-detects HLS, DASH and MP4 streams.
+Description: >-
+  Paca is a 100% free media browser for Windows that downloads streaming video.
+  It detects HLS (.m3u8), MPEG-DASH (.mpd) and progressive 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. A QR-paired Android companion streams your PC library
+  over local Wi-Fi. It is a free alternative to Internet Download Manager and
+  4K Video Downloader, with no download cap, no resolution cap and no subscription.
+Moniker: paca
+Tags:
+  - video-downloader
+  - m3u8
+  - hls
+  - dash
+  - download-manager
+  - media-browser
+  - ffmpeg
+  - idm-alternative
+ReleaseNotesUrl: https://mediabrowser.chanpaca.net/releases.html
+ManifestType: defaultLocale
+ManifestVersion: 1.12.0