feat: implement admin authentication context and update related procedures and tokens

app/gateway-api/src/adminAuth.ts

@@ -0,0 +1,9 @@
+import type { GatewaySessionInfo } from './auth/sessionService.js';
+import type { UserRecord } from './auth/userRepository.js';
+
+export interface AdminAuthContext {
+    session: GatewaySessionInfo;
+    user: UserRecord;
+    isSuperuser: boolean;
+    roles: string[];
+}