Read calendar event creators from the admin module, and archive the old ones (#14)

Reviewed-on: #14
Co-authored-by: Patrick Müller <mail@pmueller.me>
Co-committed-by: Patrick Müller <mail@pmueller.me>

test/admin/admin.config.test.ts

@@ -86,11 +86,12 @@ describe('APP_ORIGINS', () => {
 	// These reach better-auth's trustedOrigins, and the step 4 cutover made the
 	// tickets and feedback origins load-bearing: without them their sign-out
 	// call is rejected while everything else still works.
-	it('defaults to the two production frontends', async () => {
+	it('defaults to the three production frontends', async () => {
 		const config = await loadConfig();
 		expect(config.APP_ORIGINS).toEqual([
 			'https://tickets.nachklang.art',
-			'https://feedback.nachklang.art'
+			'https://feedback.nachklang.art',
+			'https://calendar.nachklang.art'
 		]);
 	});