Add ticket system with QR scanner and PDF generation

- Add ticket validation and check-in API endpoints
- Add PDF ticket generation with QR codes (pdfkit)
- Add admin QR scanner page with camera support
- Add admin site settings page
- Update email templates with PDF ticket download link
- Add checked_in_by_admin_id field for audit tracking
- Update booking success page with ticket download
- Various UI improvements to events and booking pages

frontend/src/lib/api.ts

@@ -86,8 +86,15 @@ export const ticketsApi = {
     return fetchApi<{ tickets: Ticket[] }>(`/api/tickets?${query}`);
   },
   
+  // Validate ticket by QR code (for scanner)
+  validate: (code: string, eventId?: string) =>
+    fetchApi<TicketValidationResult>('/api/tickets/validate', {
+      method: 'POST',
+      body: JSON.stringify({ code, eventId }),
+    }),
+  
   checkin: (id: string) =>
-    fetchApi<{ ticket: Ticket; message: string }>(`/api/tickets/${id}/checkin`, {
+    fetchApi<{ ticket: Ticket & { attendeeName?: string }; event?: { id: string; title: string }; message: string }>(`/api/tickets/${id}/checkin`, {
       method: 'POST',
     }),
   
@@ -141,6 +148,9 @@ export const ticketsApi = {
     fetchApi<{ ticketStatus: string; paymentStatus: string; lnbitsStatus?: string; isPaid: boolean }>(
       `/api/lnbits/status/${ticketId}`
     ),
+  
+  // Get PDF download URL (returns the URL, not the PDF itself)
+  getPdfUrl: (id: string) => `${API_BASE}/api/tickets/${id}/pdf`,
 };
 
 // Contacts API
@@ -413,6 +423,8 @@ export interface Event {
   titleEs?: string;
   description: string;
   descriptionEs?: string;
+  shortDescription?: string;
+  shortDescriptionEs?: string;
   startDatetime: string;
   endDatetime?: string;
   location: string;
@@ -441,6 +453,7 @@ export interface Ticket {
   preferredLanguage?: string;
   status: 'pending' | 'confirmed' | 'cancelled' | 'checked_in';
   checkinAt?: string;
+  checkedInByAdminId?: string;
   qrCode: string;
   adminNote?: string;
   createdAt: string;
@@ -449,6 +462,29 @@ export interface Ticket {
   user?: User;
 }
 
+export interface TicketValidationResult {
+  valid: boolean;
+  status: 'valid' | 'already_checked_in' | 'pending_payment' | 'cancelled' | 'invalid' | 'wrong_event';
+  canCheckIn: boolean;
+  ticket?: {
+    id: string;
+    qrCode: string;
+    attendeeName: string;
+    attendeeEmail?: string;
+    attendeePhone?: string;
+    status: string;
+    checkinAt?: string;
+    checkedInBy?: string;
+  };
+  event?: {
+    id: string;
+    title: string;
+    startDatetime: string;
+    location: string;
+  };
+  error?: string;
+}
+
 export interface Payment {
   id: string;
   ticketId: string;
@@ -892,3 +928,42 @@ export const dashboardApi = {
   unlinkGoogle: () =>
     fetchApi<{ message: string }>('/api/dashboard/unlink-google', { method: 'POST' }),
 };
+
+// ==================== Site Settings API ====================
+
+export interface SiteSettings {
+  id?: string;
+  timezone: string;
+  siteName: string;
+  siteDescription?: string | null;
+  siteDescriptionEs?: string | null;
+  contactEmail?: string | null;
+  contactPhone?: string | null;
+  facebookUrl?: string | null;
+  instagramUrl?: string | null;
+  twitterUrl?: string | null;
+  linkedinUrl?: string | null;
+  maintenanceMode: boolean;
+  maintenanceMessage?: string | null;
+  maintenanceMessageEs?: string | null;
+  updatedAt?: string;
+  updatedBy?: string;
+}
+
+export interface TimezoneOption {
+  value: string;
+  label: string;
+}
+
+export const siteSettingsApi = {
+  get: () => fetchApi<{ settings: SiteSettings }>('/api/site-settings'),
+  
+  update: (data: Partial<SiteSettings>) =>
+    fetchApi<{ settings: SiteSettings; message: string }>('/api/site-settings', {
+      method: 'PUT',
+      body: JSON.stringify(data),
+    }),
+  
+  getTimezones: () =>
+    fetchApi<{ timezones: TimezoneOption[] }>('/api/site-settings/timezones'),
+};