fix(frontend): generate optimized maps in Docker build (#19)

[Aduersarius]

Closes #19

Summary

• Generate gitignored frontend/public/maps_optimized during Docker frontend image build (lightweight maps stage with tsx).
• Fail loud if maps missing/invalid before next build; keep protocol:build in prebuild.
• CI exports maps before frontend build; README documents manual export for local production builds.
• Maps stay out of git (~20MB).

Acceptance

• Clean clone + Docker frontend build can serve maps
• Missing maps fail loudly with what to run
• README documents the step

vs open PRs

• fix(frontend): add prebuild validation to prevent broken Docker builds with missing maps (#19) #49 is check-only; this also generates maps in Docker.
• fix(frontend): generate optimized maps during Docker build #36/fix(docker): generate optimized maps during frontend image build #193 target pre-protocol Dockerfile and replace prebuild; this keeps protocol:build, no compose churn, tsx-only maps stage.

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