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/ai-console/settings/page.tsx

@@ -303,12 +303,12 @@ export default function AIConsoleSettingsPage() {
                 onChange={e => update('default_site_id', Number(e.target.value))}
                 className="w-full bg-[#0d1117] border border-[#2a3a50] text-white text-sm rounded-lg px-3 py-2.5 focus:outline-none focus:border-[#3b82f6]"
               >
-                <option value={1}>Broadcast Beat</option>
+                <option value={1}>AV Beat</option>
                 <option value={2}>AV Beat</option>
               </select>
             </div>
             <div>
-              <label className="block text-[#aaa] text-xs font-medium mb-1.5">Default Pen Name (Broadcast Beat)</label>
+              <label className="block text-[#aaa] text-xs font-medium mb-1.5">Default Pen Name (AV Beat)</label>
               <select
                 value={settings.default_pen_name_bb}
                 onChange={e => update('default_pen_name_bb', e.target.value)}