feat: device authorization endpoint (#270)

Co-authored-by: Elias Schneider <login@eliasschneider.com>

frontend/tests/utils/oidc.util.ts

@@ -0,0 +1,22 @@
+import type { Page } from '@playwright/test';
+
+async function getUserCode(page: Page, clientId: string, clientSecret: string) {
+	const response = await page.request
+		.post('/api/oidc/device/authorize', {
+			headers: {
+				'Content-Type': 'application/x-www-form-urlencoded'
+			},
+			form: {
+				client_id: clientId,
+				client_secret: clientSecret,
+				scope: 'openid profile email'
+			}
+		})
+		.then((r) => r.json());
+
+	return response.user_code;
+}
+
+export default {
+	getUserCode
+};