feat: página de plantillas de correo + prueba de envío + bitácora

frontend/src/lib/api.ts

@@ -338,3 +338,48 @@ export async function updateSla(
     body: JSON.stringify(data),
   });
 }
+
+// ==================== Correo / plantillas ====================
+export interface EmailTemplate {
+  key: string;
+  name: string;
+  subject: string;
+  bodyHtml: string;
+  isActive: boolean;
+}
+
+export interface EmailLogEntry {
+  id: number;
+  template: string;
+  ticketId?: number;
+  recipient: string;
+  subject: string;
+  status: string;
+  error?: string;
+  createdAt: string;
+}
+
+export async function getEmailTemplates() {
+  return fetchApi<EmailTemplate[]>("/api/helpdesk/email/templates");
+}
+
+export async function updateEmailTemplate(
+  key: string,
+  data: { subject?: string; bodyHtml?: string; isActive?: boolean }
+) {
+  return fetchApi<void>(`/api/helpdesk/email/templates/${encodeURIComponent(key)}`, {
+    method: "PUT",
+    body: JSON.stringify(data),
+  });
+}
+
+export async function getEmailLog(limit = 50) {
+  return fetchApi<EmailLogEntry[]>(`/api/helpdesk/email/log?limit=${limit}`);
+}
+
+export async function sendTestEmail(to: string) {
+  return fetchApi<{ success: boolean; message?: string }>("/api/helpdesk/email/test", {
+    method: "POST",
+    body: JSON.stringify({ to }),
+  });
+}