Merge SERVICE role into AGENT

Every AGENT now gets an auto-generated API key on creation, shown once
in a modal. AGENTs log in with password and authenticate to the API
with X-Api-Key. pre-push.sql defensively migrates any residual SERVICE
rows to AGENT before Prisma rewrites the enum. Goddard is no longer
baked into the seed — create agents via Admin → Users.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

client/src/pages/TicketDetail.tsx

@@ -243,7 +243,7 @@ export default function TicketDetail() {
   }
 
   const commentCount = ticket.comments?.length ?? 0;
-  const agentUsers = users.filter((u) => u.role !== 'SERVICE');
+  const agentUsers = users;
 
   const statusOptions: { value: TicketStatus; label: string }[] = [
     { value: 'OPEN', label: 'Open' },