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/NewTicket.tsx

@@ -105,13 +105,11 @@ export default function NewTicketModal({ onClose }: NewTicketModalProps) {
             <label className={labelClass}>Assignee</label>
             <select className={inputClass} {...register('assigneeId')}>
               <option value="">Unassigned</option>
-              {users
-                .filter((u) => u.role !== 'SERVICE')
-                .map((u) => (
-                  <option key={u.id} value={u.id}>
-                    {u.displayName}
-                  </option>
-                ))}
+              {users.map((u) => (
+                <option key={u.id} value={u.id}>
+                  {u.displayName}
+                </option>
+              ))}
             </select>
           </div>
         </div>