fix(ci): prepare initial v0.1.0 release

[darwin67]

Summary

• keep the first published release at v0.1.0 across the Phoenix and Rust manifests
• run release-container smoke tests on native AMD64 and ARM64 Blacksmith runners
• remove the unreliable QEMU dependency from the smoke-test matrix

Why

There are no existing v* tags or GitHub Releases, so the first release should use the synchronized manifest version rather than skip directly to v0.2.0.

PR #28's ARM64 image built successfully, but its AMD64 runner could not execute the image after QEMU setup and failed with exec format error. Native per-architecture runners preserve the build, architecture, and version checks without relying on broken emulation registration.

After this PR merges, the release workflow will refresh release/next and update PR #28 to prepare v0.1.0.

Verification

• mix precommit — 275 tests passed
• cargo check --workspace
• production Docker image build
• production container reports server version 0.1.0
• git diff --check