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/demo/storage.js

@@ -0,0 +1,42 @@
+import { call, os } from "@orpc/server";
+import { z } from "zod";
+import { randomUUID } from "crypto";
+import { createKV } from "../../lib/create-kv.js";
+const DemoSchema = z.object({
+    id: z.string(),
+    value: z.string(),
+});
+// createKV provides simple key-value storage with publisher/subscriber support
+// perfect for live queries and small amounts of data
+const kv = createKV("demo");
+// Handler with input validation using .input() and schema
+const create = os
+    .input(DemoSchema.omit({ id: true }))
+    .handler(async ({ input }) => {
+    const id = randomUUID();
+    const item = { id, value: input.value };
+    await kv.setItem(id, item);
+});
+const remove = os.input(z.string()).handler(async ({ input }) => {
+    await kv.removeItem(input);
+});
+// Handler without input - returns all items
+const list = os.handler(async () => {
+    return kv.getAllItems();
+});
+// Live data stream using generator function
+// Yields initial data, then subscribes to changes for real-time updates
+const live = {
+    list: os.handler(async function* ({ signal }) {
+        yield call(list, {}, { signal });
+        for await (const _ of kv.subscribe()) {
+            yield call(list, {}, { signal });
+        }
+    }),
+};
+export const router = {
+    create,
+    remove,
+    list,
+    live,
+};