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

lib/services/cron.ts

@@ -0,0 +1,24 @@
+import cron from "node-cron";
+import { syncAllEnabledCalendars } from "@/lib/services/caldav";
+import { runAppointmentReminders } from "@/lib/services/reminders";
+
+let started = false;
+
+export function startSyncCron() {
+  if (started || process.env.NODE_ENV === "test") return;
+  started = true;
+
+  cron.schedule("*/5 * * * *", async () => {
+    try {
+      await Promise.all([
+        syncAllEnabledCalendars(),
+        runAppointmentReminders()
+      ]);
+      // eslint-disable-next-line no-console
+      console.log("[calbook] CalDAV Sync ausgeführt");
+    } catch (error) {
+      // eslint-disable-next-line no-console
+      console.error("[calbook] CalDAV Sync Fehler", error);
+    }
+  });
+}