fix: complete first version issue remediation

api/src/auth/current-session-user.decorator.ts

@@ -0,0 +1,7 @@
+import { createParamDecorator, ExecutionContext } from '@nestjs/common';
+import type { SessionRequest } from './session-validation.middleware';
+
+export const CurrentSessionUserId = createParamDecorator((_: unknown, context: ExecutionContext) => {
+  const request = context.switchToHttp().getRequest<SessionRequest>();
+  return request.sessionUserId;
+});