Replace Resend with n8n webhook relay for emails

- email.ts: POST to N8N_EMAIL_WEBHOOK_URL instead of Resend API
- env.ts: replace RESEND_API_KEY with N8N_EMAIL_WEBHOOK_URL
- .env.example: document new env var
- Add n8n workflow JSON (Webhook -> Gmail -> Respond) ready to import

apps/api/src/config/env.ts

@@ -22,8 +22,8 @@ export const env = {
   SUPABASE_URL: required('SUPABASE_URL'),
   SUPABASE_SERVICE_ROLE_KEY: required('SUPABASE_SERVICE_ROLE_KEY'),
 
-  // Email — Resend
-  RESEND_API_KEY: required('RESEND_API_KEY'),
+  // Email — n8n webhook (relé a Gmail)
+  N8N_EMAIL_WEBHOOK_URL: required('N8N_EMAIL_WEBHOOK_URL'),
   EMAIL_FROM: optional('EMAIL_FROM', 'Naturcalabacera <reservas@naturcalabacera.com>'),
 
   // Destinatarios de notificaciones (configurables, sin hardcodear)

apps/api/src/services/email.ts

@@ -7,40 +7,34 @@ interface SendEmailOptions {
   replyTo?: string;
 }
 
-interface ResendResponse {
-  id?: string;
-  error?: { message: string; name: string };
-}
-
 /**
- * Envía un email usando la API de Resend.
- * Docs: https://resend.com/docs/api-reference/emails/send-email
+ * Envía un email a través del webhook de n8n.
+ * El workflow de n8n recibe { to, subject, html } y lo envía vía Gmail.
  */
 export async function sendEmail(options: SendEmailOptions): Promise<{ success: boolean; id?: string; error?: string }> {
   try {
-    const res = await fetch('https://api.resend.com/emails', {
+    const to = Array.isArray(options.to) ? options.to.join(', ') : options.to;
+
+    const res = await fetch(env.N8N_EMAIL_WEBHOOK_URL, {
       method: 'POST',
-      headers: {
-        'Authorization': `Bearer ${env.RESEND_API_KEY}`,
-        'Content-Type': 'application/json',
-      },
+      headers: { 'Content-Type': 'application/json' },
       body: JSON.stringify({
-        from: env.EMAIL_FROM,
-        to: Array.isArray(options.to) ? options.to : [options.to],
+        to,
         subject: options.subject,
         html: options.html,
-        ...(options.replyTo && { reply_to: options.replyTo }),
+        from: env.EMAIL_FROM,
+        replyTo: options.replyTo,
       }),
     });
 
-    const data = await res.json() as ResendResponse;
-
-    if (!res.ok || data.error) {
-      const errorMsg = data.error?.message ?? `HTTP ${res.status}`;
+    if (!res.ok) {
+      const text = await res.text().catch(() => '');
+      const errorMsg = `HTTP ${res.status}${text ? ` — ${text.slice(0, 200)}` : ''}`;
       console.error('[email] Error al enviar:', errorMsg);
       return { success: false, error: errorMsg };
     }
 
+    const data = await res.json().catch(() => ({})) as { id?: string };
     return { success: true, id: data.id };
   } catch (err) {
     const errorMsg = err instanceof Error ? err.message : 'Error desconocido';