Move status and audit label constants to shared/constants/labels

STATUS_LABELS was defined in the server, AUDIT_LABELS and AUDIT_COLORS
in the client. Both layers now import from a single shared source.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/services/ticketService.ts

@@ -40,12 +40,7 @@ const ticketListInclude = {
   _count: { select: { comments: true, attachments: true } },
 } as const;
 
-const STATUS_LABELS: Record<string, string> = {
-  OPEN: 'Open',
-  IN_PROGRESS: 'In Progress',
-  RESOLVED: 'Resolved',
-  CLOSED: 'Closed',
-};
+import { STATUS_LABELS } from '../../../shared/constants/labels';
 
 export type TicketFilters = {
   status?: string;