Bookings/payments/linktree: fix payment method display, event filter, logo, search

- Bookings: align payment method labels with payments page (bank_transfer, tpago, etc), add sibling fallback
- Payments: add event filter (single/multi), add search by name/email/event
- Linktree: use Spanglish logo instead of icon
- API: payments getAll supports eventId/eventIds

Made-with: Cursor

frontend/src/lib/api.ts

@@ -236,11 +236,13 @@ export const usersApi = {
 
 // Payments API
 export const paymentsApi = {
-  getAll: (params?: { status?: string; provider?: string; pendingApproval?: boolean }) => {
+  getAll: (params?: { status?: string; provider?: string; pendingApproval?: boolean; eventId?: string; eventIds?: string[] }) => {
     const query = new URLSearchParams();
     if (params?.status) query.set('status', params.status);
     if (params?.provider) query.set('provider', params.provider);
     if (params?.pendingApproval) query.set('pendingApproval', 'true');
+    if (params?.eventId) query.set('eventId', params.eventId);
+    if (params?.eventIds && params.eventIds.length > 0) query.set('eventIds', params.eventIds.join(','));
     return fetchApi<{ payments: PaymentWithDetails[] }>(`/api/payments?${query}`);
   },