Cache SDKs and deduplicate build assets across matrix

[HudsonGraeme]

Summary

• Extracts a prepare job that runs Node.js setup, pnpm install, and pnpm build once, sharing dist/ via artifact to all 8 matrix jobs
• Caches the OpenWrt SDKs (pinned to 24.10.5, ~200MB each) between workflow runs so subsequent builds skip the download + extract
• Computes version once in the prepare job and passes it as an output, eliminating duplicated version logic across steps

Test plan

• Add run-build label to trigger a PR build and verify the prepare job completes before matrix jobs start
• Verify SDK cache is populated on first run and hit on subsequent runs
• Verify packages are still built correctly for all architectures

Depends on #8

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 4b92fc3e-e0e2-4bfc-a200-4e59daef4974

📥 Commits

Reviewing files that changed from the base of the PR and between 6db0967 and 144116e.

📒 Files selected for processing (1)

• .github/workflows/build-release.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch ci/cache-build-assets

📝 Coding Plan

• Generate coding plan for human review comments

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