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/lib/marketplace/emailService.ts

@@ -22,7 +22,7 @@ async function sendEmail(payload: MarketplaceEmailPayload): Promise<void> {
 export async function sendProfileApprovedEmail(to: string, name: string): Promise<void> {
   await sendEmail({
     to,
-    subject: 'Your Broadcast Beat Marketplace Profile is Approved!',
+    subject: 'Your AV Beat Marketplace Profile is Approved!',
     html: `
       <div style="font-family: Arial, sans-serif; max-width: 600px; margin: 0 auto; background: #0d0d0d; color: #fff; padding: 32px; border-radius: 8px;">
         <div style="text-align: center; margin-bottom: 24px;">
@@ -32,7 +32,7 @@ export async function sendProfileApprovedEmail(to: string, name: string): Promis
         <h2 style="color: #fff; font-size: 20px;">Welcome to the Marketplace, ${name}!</h2>
         <p style="color: #ccc; line-height: 1.6;">
           Your profile has been reviewed and approved by our team. You are now live in the 
-          Broadcast Beat Production Marketplace and visible to clients, employers, and production companies.
+          AV Beat Production Marketplace and visible to clients, employers, and production companies.
         </p>
         <div style="background: #1a1a1a; border-left: 4px solid #CC0000; padding: 16px; margin: 24px 0; border-radius: 4px;">
           <p style="color: #fff; margin: 0; font-weight: bold;">Next Steps:</p>
@@ -47,8 +47,8 @@ export async function sendProfileApprovedEmail(to: string, name: string): Promis
           View Your Profile
         </a>
         <p style="color: #666; font-size: 12px; margin-top: 32px;">
-          Broadcast Beat — Official NAB Show Media Partner<br>
-          <a href="${process.env.NEXT_PUBLIC_SITE_URL}" style="color: #CC0000;">broadcastbeat.com</a>
+          AV Beat — Official NAB Show Media Partner<br>
+          <a href="${process.env.NEXT_PUBLIC_SITE_URL}" style="color: #CC0000;">avbeat.com</a>
         </p>
       </div>
     `,
@@ -62,7 +62,7 @@ export async function sendProfileRejectedEmail(
 ): Promise<void> {
   await sendEmail({
     to,
-    subject: 'Update Required: Your Broadcast Beat Marketplace Profile',
+    subject: 'Update Required: Your AV Beat Marketplace Profile',
     html: `
       <div style="font-family: Arial, sans-serif; max-width: 600px; margin: 0 auto; background: #0d0d0d; color: #fff; padding: 32px; border-radius: 8px;">
         <div style="text-align: center; margin-bottom: 24px;">
@@ -86,7 +86,7 @@ export async function sendProfileRejectedEmail(
           Update My Profile
         </a>
         <p style="color: #666; font-size: 12px; margin-top: 32px;">
-          Questions? Reply to this email or contact us at <a href="mailto:marketplace@broadcastbeat.com" style="color: #CC0000;">marketplace@broadcastbeat.com</a>
+          Questions? Reply to this email or contact us at <a href="mailto:marketplace@avbeat.com" style="color: #CC0000;">marketplace@avbeat.com</a>
         </p>
       </div>
     `,
@@ -112,7 +112,7 @@ export async function sendListingConfirmationEmail(
           Your ${listingType === 'job' ? 'Job Post' : 'Gig Request'} is Live!
         </h2>
         <p style="color: #ccc; line-height: 1.6;">
-          <strong style="color: #fff;">"${title}"</strong> has been posted to the Broadcast Beat Marketplace 
+          <strong style="color: #fff;">"${title}"</strong> has been posted to the AV Beat Marketplace 
           and is now visible to our network of broadcast and production professionals.
         </p>
         <a href="${process.env.NEXT_PUBLIC_SITE_URL}/marketplace/${listingType === 'job' ? 'jobs' : 'gigs'}" 
@@ -120,7 +120,7 @@ export async function sendListingConfirmationEmail(
           View ${listingType === 'job' ? 'Job Board' : 'Gig Board'}
         </a>
         <p style="color: #666; font-size: 12px; margin-top: 32px;">
-          Broadcast Beat — Official NAB Show Media Partner
+          AV Beat — Official NAB Show Media Partner
         </p>
       </div>
     `,