feat: improve account management and welcome emails

server/src/services/email.ts

@@ -0,0 +1,20 @@
+import { config } from '../config.js';
+
+type WelcomeRecipient = { name: string; email: string };
+
+export async function sendWelcomeEmail(recipient: WelcomeRecipient) {
+  if (!config.RESEND_API_KEY || !config.EMAIL_FROM) return false;
+
+  const escapedName = recipient.name.replace(/[&<>"']/g, (character) => ({ '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;', "'": '&#039;' }[character] || character));
+  const response = await fetch('https://api.resend.com/emails', {
+    method: 'POST',
+    headers: { Authorization: `Bearer ${config.RESEND_API_KEY}`, 'Content-Type': 'application/json' },
+    body: JSON.stringify({
+      from: config.EMAIL_FROM,
+      to: [recipient.email],
+      subject: 'Bem-vindo(a) ao Compor HUB',
+      html: `<main style="font-family:Arial,sans-serif;color:#18181b;line-height:1.55"><h1>Bem-vindo(a), ${escapedName}!</h1><p>Sua conta no <strong>Compor HUB</strong> já está pronta.</p><p>Agora você pode acessar cursos, acompanhar suas aulas e baixar materiais complementares.</p><p><a href="${config.FRONTEND_ORIGIN}" style="display:inline-block;background:#f97316;color:#fff;padding:12px 18px;border-radius:8px;text-decoration:none;font-weight:700">Acessar Compor HUB</a></p></main>`,
+    }),
+  });
+  return response.ok;
+}