fix(network): 移除 PREROUTING 中的非法 MASQUERADE 规则 #49

Job	Run time
verify / Go Tests	1m 2s
verify / Image Size Regression (BASE-04 ≤ 2GB)	1m 11s
verify / Web Build	17s
verify / Performance Benchmark (synthetic 10k, local baseline)	1m 12s
create-release	11s
build-binaries (darwin, arm64)	30s
build-binaries (linux, amd64)	32s
build-binaries (linux, arm64)	37s
build-binaries (darwin, amd64)	33s
publish-images / build (control-plane, deploy/docker/control-plane/Dockerfile, .)	6m 19s
publish-images / build (admin, deploy/docker/admin/Dockerfile, .)	1m 20s
publish-images / build (managed-user, deploy/docker/managed-user/Dockerfile, .)	2m 0s
publish-images / build (sing-box-gateway, deploy/docker/sing-box-gateway/Dockerfile, .)	45s
update-homebrew	7s
	16m 36s

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