fix and update

apps/frontend/lib/project-domains.ts

@@ -0,0 +1,28 @@
+/** Публичные домены IdP (split-domain: API и SSO на разных хостах). */
+export const PROJECT_API_HOST = 'api.idpmvk.lpr';
+export const PROJECT_SSO_HOST = 'sso.idpmvk.lpr';
+
+export const DEFAULT_PUBLIC_API_URL = `https://${PROJECT_API_HOST}`;
+export const DEFAULT_PUBLIC_FRONTEND_URL = `https://${PROJECT_SSO_HOST}`;
+
+export function inferApiBaseFromProjectDomain(domain: string): string | null {
+  const host = domain
+    .trim()
+    .replace(/^https?:\/\//i, '')
+    .split('/')[0]
+    .toLowerCase();
+
+  if (!host) {
+    return null;
+  }
+
+  if (host.startsWith('sso.')) {
+    return `https://${host.replace(/^sso\./, 'api.')}`;
+  }
+
+  if (host.startsWith('api.')) {
+    return `https://${host}`;
+  }
+
+  return null;
+}