feat: Enhance ticketing system with categories, templates, SLA tracking, and fix frontend integration

- Add ticket categories (billing, technical, feature_request, etc.) with type-specific options
- Add TicketTemplate and CannedResponse models for quick ticket creation
- Implement SLA tracking with due_at and first_response_at fields
- Add is_platform_admin and is_customer helper functions to fix permission checks
- Register models in Django admin with filters and fieldsets
- Enhance signals with error handling for WebSocket notifications
- Fix frontend API URLs for templates and canned responses
- Update PlatformSupport page to use real ticketing API
- Add comprehensive i18n translations for all ticket fields

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

frontend/src/api/tickets.ts

@@ -1,8 +1,23 @@
-import { apiClient } from './client';
-import { Ticket, TicketComment } from '../types'; // Assuming types.ts will define these
+import apiClient from './client';
+import { Ticket, TicketComment, TicketTemplate, CannedResponse, TicketStatus, TicketPriority, TicketCategory, TicketType } from '../types';
 
-export const getTickets = async (): Promise<Ticket[]> => {
-  const response = await apiClient.get('/api/tickets/');
+export interface TicketFilters {
+  status?: TicketStatus;
+  priority?: TicketPriority;
+  category?: TicketCategory;
+  ticketType?: TicketType;
+  assignee?: string;
+}
+
+export const getTickets = async (filters?: TicketFilters): Promise<Ticket[]> => {
+  const params = new URLSearchParams();
+  if (filters?.status) params.append('status', filters.status);
+  if (filters?.priority) params.append('priority', filters.priority);
+  if (filters?.category) params.append('category', filters.category);
+  if (filters?.ticketType) params.append('ticket_type', filters.ticketType);
+  if (filters?.assignee) params.append('assignee', filters.assignee);
+
+  const response = await apiClient.get(`/api/tickets/${params.toString() ? `?${params.toString()}` : ''}`);
   return response.data;
 };
 
@@ -34,3 +49,20 @@ export const createTicketComment = async (ticketId: string, data: Partial<Ticket
   const response = await apiClient.post(`/api/tickets/${ticketId}/comments/`, data);
   return response.data;
 };
+
+// Ticket Templates
+export const getTicketTemplates = async (): Promise<TicketTemplate[]> => {
+  const response = await apiClient.get('/api/tickets/templates/');
+  return response.data;
+};
+
+export const getTicketTemplate = async (id: string): Promise<TicketTemplate> => {
+  const response = await apiClient.get(`/api/tickets/templates/${id}/`);
+  return response.data;
+};
+
+// Canned Responses
+export const getCannedResponses = async (): Promise<CannedResponse[]> => {
+  const response = await apiClient.get('/api/tickets/canned-responses/');
+  return response.data;
+};