chore: purge all rocket.new references from source

- Replace img.rocket.new mock URLs in authors/[slug] + FeaturedBento
  with /assets/images/article-placeholder.svg (live DB data drives
  these pages now; the static maps are fallback only).
- Replace broadcastb5322.builtwithrocket.new with broadcastbeat.com
  in admin API routes, news detail, forum layout, and the 4 Supabase
  edge functions that build outbound email links.
- Swap rocket-hosted JSON-LD logo URL in root layout for the local
  /assets/images/logo.png we already ship.
- Drop img.rocket.new from the Next.js image-hosts allowlist;
  add supabase.onsethost.com so storage proxy URLs can render.

The DB has had zero rocket.new image refs for weeks; this finishes
the job in the codebase so no page on broadcastbeat.com can render
a rocket-hosted asset anymore.

src/app/api/admin/company-coverage-reminder/route.ts

@@ -31,12 +31,12 @@ export async function POST(request: NextRequest) {
             <ul style="margin:0;padding-left:20px;color:#e5e5e5;font-size:14px;line-height:1.8;">${companyList}</ul>
             ${moreText}
           </div>
-          <a href="${process.env.NEXT_PUBLIC_SITE_URL || 'https://broadcastb5322.builtwithrocket.new'}/admin/company-tracker"
+          <a href="${process.env.NEXT_PUBLIC_SITE_URL || 'https://broadcastbeat.com'}/admin/company-tracker"
              style="display:inline-block;background:#3b82f6;color:#fff;text-decoration:none;padding:10px 20px;border-radius:6px;font-size:14px;font-weight:bold;">
             Review Story Queue →
           </a>
           <p style="color:#444;font-size:12px;margin-top:24px;">
-            Manage settings at <a href="${process.env.NEXT_PUBLIC_SITE_URL || 'https://broadcastb5322.builtwithrocket.new'}/admin/company-tracker" style="color:#3b82f6;">Company Tracker</a>
+            Manage settings at <a href="${process.env.NEXT_PUBLIC_SITE_URL || 'https://broadcastbeat.com'}/admin/company-tracker" style="color:#3b82f6;">Company Tracker</a>
           </p>
         </div>
       `,