feat: CalDAV-Integration für Admin-Kalender

- Neue CalDAV-Route mit PROPFIND und GET-Endpoints
- ICS-Format-Generator für Buchungsdaten
- Token-basierte Authentifizierung für CalDAV-Zugriff
- Admin-Interface mit CalDAV-Link-Generator
- Schritt-für-Schritt-Anleitung für Kalender-Apps
- 24h-Token-Ablaufzeit für Sicherheit
- Unterstützung für Outlook, Google Calendar, Apple Calendar, Thunderbird

Fixes: Admin kann jetzt Terminkalender in externen Apps abonnieren

server-dist/rpc/index.js

@@ -0,0 +1,20 @@
+import { demo } from "./demo/index.js";
+import { router as treatments } from "./treatments.js";
+import { router as bookings } from "./bookings.js";
+import { router as auth } from "./auth.js";
+import { router as recurringAvailability } from "./recurring-availability.js";
+import { router as cancellation } from "./cancellation.js";
+import { router as legal } from "./legal.js";
+import { router as gallery } from "./gallery.js";
+import { router as reviews } from "./reviews.js";
+export const router = {
+    demo,
+    treatments,
+    bookings,
+    auth,
+    recurringAvailability,
+    cancellation,
+    legal,
+    gallery,
+    reviews,
+};