feat(docker): Bundle Unified Base Binary

[refcell]

Summary

This adds the unified base node binary to the shared Rust services Docker image alongside the existing base-client compatibility entrypoint. The Docker README now documents that the image bundles base, base-consensus, basectl, and snapshotter.

[cb-heimdall]

🟡 Heimdall Review Status

Requirement	Status	More Info
Reviews	🟡 0/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 0 Sum 1

[github-actions]

Review: No issues found.

This is a clean, minimal Docker-only change. Verified:

• The base binary target exists at bin/base/ (name = "base", described as "Unified Base node binary")
• The client-builder stage correctly adds --bin base to the cargo build and copies the resulting binary
• The client runtime stage correctly COPYs the binary from the builder
• The README update accurately documents the image now bundles the unified base binary
• The changes follow existing Dockerfile patterns consistently
• No redundancy concern: the standalone base-builder stage (line 75-81) remains useful for the separate base runtime target (line 165-167), while the client target bundles everything together

[github-actions]

✅ base-std fork tests: all 608 passed

base/base is fully in sync with the base-std spec.