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

Dockerfile

@@ -14,11 +14,7 @@ ENV NEXT_PUBLIC_SITE_URL=$NEXT_PUBLIC_SITE_URL
 ENV NEXT_PUBLIC_GA_MEASUREMENT_ID=$NEXT_PUBLIC_GA_MEASUREMENT_ID
 
 COPY package*.json ./
-# Force dev-deps even if NODE_ENV=production was supplied as a Coolify
-# build arg — autoprefixer/postcss/tailwindcss live in devDependencies and
-# Next.js needs them at build time. Same fix that landed for RMP cold-build
-# on 2026-05-30.
-RUN npm install --include=dev
+RUN npm install
 COPY . .
 RUN npm run build
 ENV NODE_ENV=production