Niubi Guard v0.1.0

Initial open-source release.\n\nHighlights:\n- Executable npm CLI package with niubi-guard bin\n- Rule detection, optional AI detection, and dry-run response planning\n- Next.js Web UI policy builder\n- CI, tests, Dockerfile, and open-source project templates\n\nPackage asset:\n- niubi-guard-0.1.0.tgz\n- SHA-256: a93e049ace74c5bd8e5c8b807a1e4625d73c699dbe21ca5581b0d42ea707e444