feat: add donation support with footer card and navigation

Add donation functionality to encourage community support, including a footer card on the home page, a highlighted "Apoiar" link in the header, and comprehensive English messages for the donation section to promote transparency and user engagement.

types/donation.ts

@@ -0,0 +1,59 @@
+export interface DonationTier {
+  id: string;
+  amount?: number;
+  title: string;
+  description: string;
+  icon: "coffee" | "pizza" | "heart";
+  badge?: string;
+  highlighted?: boolean;
+}
+
+export interface DonationData {
+  amount: number;
+  donorName?: string;
+  donorEmail?: string;
+  message?: string;
+}
+
+export interface DonationResponse {
+  success: boolean;
+  billingId?: string;
+  pixCode?: string;
+  pixQrCode?: string;
+  expiresAt?: string;
+  error?: string;
+}
+
+export interface BillingStatus {
+  id: string;
+  amount: number;
+  status: "PENDING" | "PAID" | "EXPIRED" | "CANCELLED";
+  pixCode: string;
+  pixQrCode: string;
+  expiresAt: string;
+  createdAt: string;
+}
+
+export interface DonationStats {
+  totalSupporters: number;
+  totalRaised: number;
+  monthsOnline: number;
+  uptime: number;
+}
+
+export interface TransparencyData {
+  hosting: number;
+  development: number;
+  support: number;
+  emergency: number;
+}
+
+export interface Supporter {
+  id: string;
+  name: string;
+  avatar?: string;
+  amount: number;
+  message?: string;
+  createdAt: string;
+  anonymous?: boolean;
+}