feat(cli): allow prebuild images for langgraph deploy

[hari-dhanushkodi]

Fixes #

adds a --image flag to langgraph deploy, allows a user to langgraph build a custom image and then deploy this specific image with langgraph deploy.

[open-swe]

✅ Open SWE Review: No issues found

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[Asamu David (phvash)]

Looks good. Non-blocking, but two ux improvement suggestions"

1. we should add existence check for the image, and
2. We should also confirm the image's platform is linux/amd64 to avoid any gotchas during deployment.

[open-swe]

Open SWE Review found 1 potential issue.

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[open-swe]

🟡 Missing Docker crashes image validation

With --image, _resolve_build_mode(..., force_local=True) skips the existing can_build_locally() preflight, so this helper is the first place that invokes Docker. If the Docker binary is not installed, asyncio.create_subprocess_exec("docker", ...) raises FileNotFoundError (and the subprocess helper can surface that instead of click.exceptions.Exit), which is not caught here. That makes langgraph deploy --image ... crash with a traceback on machines without Docker instead of returning the actionable Docker-required error that the normal local-build path provides. Please catch the missing-binary case here or keep the Docker availability preflight for --image.

(Refers to lines 384-388)

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