refactor(support): replace mock data with real costs and simplify stats

Updated support page to use real data instead of mock values, including monthly costs

types/donation.ts

@@ -18,6 +18,7 @@ export interface DonationData {
 export interface DonationResponse {
   success: boolean;
   billingId?: string;
+  paymentUrl?: string;
   pixCode?: string;
   pixQrCode?: string;
   expiresAt?: string;