feat(seo): make paca.chanpaca.net the canonical domain for the whole site

Both hostnames served the same sitemap and feed, so the sitemap submitted for
paca.chanpaca.net listed only mediabrowser.chanpaca.net URLs and Naver rejected
it as not matching the verified domain. Switch every canonical URL, Open Graph
tag, hreflang, JSON-LD, sitemap, RSS feed, llms files, app share link, package
manifest and promo UTM to paca.chanpaca.net, then resubmit the corrected Naver
and Search Console sitemaps. All 2,757 tests pass.

💘 Generated with Crush

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

site/vs-idm-alternative.html

@@ -9,11 +9,11 @@
 <meta property="og:type" content="article">
 <meta property="og:title" content="2026 최고의 무료 비디오 다운로더: IDM 대체 프로그램 Paca 완벽 비교">
 <meta property="og:description" content="유료 결제나 크랙 위험 없이! IDM과 4K Video Downloader를 압도하는 100% 무료 미디어 브라우저 Paca.">
-<meta property="og:url" content="https://mediabrowser.chanpaca.net/vs-idm-alternative.html">
-<meta property="og:image" content="https://mediabrowser.chanpaca.net/assets/og.jpg">
+<meta property="og:url" content="https://paca.chanpaca.net/vs-idm-alternative.html">
+<meta property="og:image" content="https://paca.chanpaca.net/assets/og.jpg">
 <meta name="theme-color" content="#08090d">
-<link rel="canonical" href="https://mediabrowser.chanpaca.net/vs-idm-alternative.html">
-<link rel="alternate" hreflang="ko" href="https://mediabrowser.chanpaca.net/vs-idm-alternative.html">
+<link rel="canonical" href="https://paca.chanpaca.net/vs-idm-alternative.html">
+<link rel="alternate" hreflang="ko" href="https://paca.chanpaca.net/vs-idm-alternative.html">
 <meta name="twitter:card" content="summary_large_image">
 
 <script type="application/ld+json">