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.

app/api/webhooks/abacatepay/route.ts

@@ -0,0 +1,45 @@
+import { NextRequest, NextResponse } from "next/server";
+import { abacatePay } from "@/lib/abacatepay";
+
+export async function POST(request: NextRequest) {
+  try {
+    const payload = await request.text();
+    const signature = request.headers.get("x-abacatepay-signature");
+
+    if (!signature || !abacatePay.verifyWebhookSignature(payload, signature)) {
+      return NextResponse.json(
+        { error: "Assinatura inválida" },
+        { status: 401 }
+      );
+    }
+
+    const event = JSON.parse(payload);
+
+    if (event.type === "billing.paid") {
+      // Processar doação confirmada
+      console.log("Donation confirmed:", event.data.id);
+
+      // Aqui você pode:
+      // 1. Salvar no banco de dados
+      // 2. Enviar email de agradecimento
+      // 3. Atualizar estatísticas
+      // 4. Notificar a equipe
+
+      // Por enquanto, apenas log
+      console.log("Donation details:", {
+        id: event.data.id,
+        amount: event.data.amount,
+        metadata: event.data.metadata,
+        paidAt: event.data.paidAt,
+      });
+    }
+
+    return NextResponse.json({ success: true });
+  } catch (error) {
+    console.error("Webhook error:", error);
+    return NextResponse.json(
+      { error: "Erro ao processar webhook" },
+      { status: 500 }
+    );
+  }
+}