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perf(ci): parallelize Katapult builds and add batch base image

- Add freegle-batch-base image (Dockerfile.base) containing compiled PHP
  extensions, PECL redis/pcov, Node.js 20, MJML — reduces batch build
  from ~10 min to ~1-2 min (just COPY + composer install)
- Build all container groups in parallel on Katapult (16 CPUs): PHP,
  Go, Nuxt, playwright+status each as independent background processes
- Move Vitest into parallel test block on Katapult (no Docker dependency,
  pure mocked unit tests) — saves ~3 min vs sequential pre-step
- Remove retired iznik-server PHPUnit test references from parallel block
- Bump PW_WORKERS 11→13 and VITEST_MAX_WORKERS 8→12 for Katapult
- WSL runner unchanged: legacy builder still used to avoid BuildKit bug
- Add GitHub Actions workflow to rebuild base image on Dockerfile.base change

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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