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/dashboard/adops/page.tsx

@@ -47,7 +47,7 @@ interface Stats {
 }
 
 const PUBLICATIONS = [
-  { id: 'broadcast-beat', name: 'Broadcast Beat', short: 'BB' },
+  { id: 'broadcast-beat', name: 'AV Beat', short: 'BB' },
   { id: 'av-beat', name: 'AV Beat', short: 'AV' },
 ];
 
@@ -218,7 +218,7 @@ export default function AdOpsDashboard() {
               </button>
               <span className="inline-flex items-center gap-1.5 px-2.5 py-1 rounded-full text-xs font-medium bg-orange-900/50 text-orange-300 border border-orange-700">
                 <span className="w-1.5 h-1.5 rounded-full bg-orange-400" />
-                adops@broadcastbeat.com
+                adops@avbeat.com
               </span>
             </div>
           </div>