Implement pkg-docker buildx planning

[Zekbot001]

Summary- replace the pkg-docker tag-only stub with deterministic Docker buildx planning- write docker-build-plan.json containing local OCI-build and push commands- support registry host normalization, version/tag templating, build args, labels, and targets- execute docker buildx build --push only when shipping outside dry-run mode## Paid task- uGig task: https://ugig.net/gigs/134f0007-139c-4cb8-98eb-652b5846f9ab- GitHub task thread: #6## Validation- corepack pnpm@9.12.0 exec vitest run packages/targets/pkg-docker/src/index.test.ts- corepack pnpm@9.12.0 --filter @profullstack/sh1pt-target-pkg-docker typecheck- corepack pnpm@9.12.0 --filter @profullstack/sh1pt-target-pkg-docker build- git diff --check

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