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/content-status/page.tsx

@@ -47,7 +47,7 @@ interface LaunchChecklist {
 // ─── Site labels ──────────────────────────────────────────────────────────────
 
 const SITE_LABELS: Record<string, { label: string; color: string; target: string }> = {
-  'broadcast-beat': { label: 'Broadcast Beat', color: 'text-blue-400', target: '15–25/day' },
+  'broadcast-beat': { label: 'AV Beat', color: 'text-blue-400', target: '15–25/day' },
   'av-beat': { label: 'AV Beat', color: 'text-purple-400', target: '10–15/day' },
   'backlot-beat': { label: 'Backlot Beat', color: 'text-amber-400', target: '10–15/day' },
   'broadcast-engineering': { label: 'BroadcastEngineering.com', color: 'text-green-400', target: '10–15/day' },