feat: initialize CalBook project with comprehensive scheduling, admin, and deployment infrastructure

lib/email/template-engine.ts

@@ -0,0 +1,29 @@
+export function renderTemplate(template: string, values: Record<string, string>) {
+  let output = template;
+  for (const [key, value] of Object.entries(values)) {
+    output = output.replaceAll(`{{${key}}}`, value);
+  }
+  return output;
+}
+
+export const EMAIL_TEMPLATE_PREVIEW_VALUES: Record<string, string> = {
+  customerName: "Max Mustermann",
+  date: "20.04.2026",
+  time: "10:15",
+  duration: "60",
+  staffName: "Anna Beispiel",
+  staffNames: "Anna Beispiel, Ben Demo",
+  phone: "+49 170 000000",
+  email: "max@example.com",
+  notes: "Ich möchte mich zu einem Projekt beraten lassen.",
+  companyName: "CalBook",
+  cancelUrl: "https://calbook.example/stornieren?token=demo",
+  rescheduleUrl: "https://calbook.example/buchen?rescheduleToken=demo",
+  meetingUrl: "https://meet.jit.si/calbook-demo-room",
+  meetingButton: "{{meetingButton}}",
+  reminderLabel: "in 24 Stunden",
+  hoursBefore: "24",
+  reminderKind: "primary",
+  timezone: "Europe/Berlin",
+  dashboardUrl: "https://calbook.example/admin/termine"
+};