Changes:
- Add change detection (only build what changed)
- Add skip_api/skip_web manual inputs for selective builds
- Use native Docker BuildKit (remove buildx-action overhead)
- Add local Next.js cache (/home/wooo/build-cache/awoooi/)
- Split build-images into build-api and build-web jobs
Reference: wooo-aiops ci.yml and fast-deploy-uat.yml
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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