av: clone broadcastbeat sources + AV Beat rebrand (Phase 1)

- Replaces the prior Rocket scaffold (saved on pre-bb-clone-rollback branch)
- Domain: broadcastbeat.com -> avbeat.com
- Brand: Broadcast Beat -> AV Beat
- Slug: broadcastbeat -> avbeat (package, identifiers)
- Schema fallback: bb -> av (env var name unchanged)
- Placeholder AV BEAT logo (gold->red gradient) at /assets/logos/av.svg
- All BB/RMP logo references repointed

Outstanding before public DNS swap:
  - Supabase av schema bootstrap (mirror of bb tables)
  - WordPress archive import (avbeat-com -> av.articles)
  - Coolify env vars
  - dev-avbeat.onsethost.com staging deploy + visual review

src/app/admin/import/page.tsx

@@ -158,8 +158,8 @@ export default function WPImportPage() {
               <h1 className="text-2xl font-bold text-white font-heading">WordPress Post Importer</h1>
               <p className="text-[#666] text-sm mt-1">
                 Import posts from{' '}
-                <a href="https://www.broadcastbeat.com" target="_blank" rel="noopener noreferrer" className="text-[#3b82f6] hover:underline">
-                  broadcastbeat.com
+                <a href="https://www.avbeat.com" target="_blank" rel="noopener noreferrer" className="text-[#3b82f6] hover:underline">
+                  avbeat.com
                 </a>{' '}
                 via WordPress REST API
               </p>
@@ -228,7 +228,7 @@ export default function WPImportPage() {
                 <div className="w-5 h-5 border-2 border-[#3b82f6] border-t-transparent rounded-full animate-spin flex-shrink-0" />
                 <div>
                   <p className="text-[#3b82f6] text-sm font-bold">Import in progress</p>
-                  <p className="text-[#666] text-xs mt-0.5">Fetching posts from broadcastbeat.com and saving to database...</p>
+                  <p className="text-[#666] text-xs mt-0.5">Fetching posts from avbeat.com and saving to database...</p>
                 </div>
               </div>
               <div className="mt-3 h-1.5 bg-[#1a2535] rounded-full overflow-hidden">
@@ -365,11 +365,11 @@ export default function WPImportPage() {
                         </div>
                         <div className="flex items-center gap-2 flex-shrink-0">
                           <a
-                            href={`https://www.broadcastbeat.com/${post.wp_slug}`}
+                            href={`https://www.avbeat.com/${post.wp_slug}`}
                             target="_blank"
                             rel="noopener noreferrer"
                             className="text-[#555] hover:text-[#3b82f6] transition-colors p-1"
-                            title="View on broadcastbeat.com">
+                            title="View on avbeat.com">
                             <svg width="13" height="13" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2">
                               <path d="M18 13v6a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V8a2 2 0 0 1 2-2h6" /><polyline points="15 3 21 3 21 9" /><line x1="10" y1="14" x2="21" y2="3" />
                             </svg>