fix(bootstrap): validate gateway names before path joins #2034

Job	Run time
Resolve PR metadata	8s
build-gateway / Resolve build plan	3s
build-supervisor / Resolve build plan	4s
build-gateway / Rust gateway (arm64) / gateway (arm64)	7m 2s
build-gateway / Rust gateway (amd64) / gateway (amd64)	6m 15s
build-supervisor / Rust sandbox (amd64) / sandbox (amd64)	3m 20s
build-supervisor / Rust sandbox (arm64) / sandbox (arm64)	3m 39s
build-supervisor / Build supervisor (arm64)	1m 22s
build-supervisor / Build supervisor (amd64)	1m 23s
build-supervisor / Merge supervisor manifest	1m 2s
build-gateway / Build gateway (amd64)	1m 28s
build-gateway / Build gateway (arm64)	1m 30s
gpu-e2e	0s
GPU E2E result	0s
build-gateway / Merge gateway manifest	1m 4s
kubernetes-e2e / Kubernetes E2E (Rust smoke)	9m 41s
e2e / E2E (rust-podman-rootless)	15m 46s
e2e / E2E (python)	6m 46s
e2e / E2E (rust-docker)	8m 17s
e2e / E2E (rust-podman)	14m 21s
kubernetes-ha-e2e	-1s
Kubernetes HA E2E result	-1s
Core E2E result	3s
	1h 23m 12s

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