Update dev setup: GitHub Actions, propshaft, MIT license

[damianlegawiec]

Summary

• Migrate CI from CircleCI to GitHub Actions with PostgreSQL 16 + MySQL 8.0 matrix
• Switch from sprockets to propshaft
• Add spree_storefront, spree_page_builder, spree_admin, and spree_legacy_api_v2 dependencies
• Add SPREE_PATH env support for local development
• Update Rakefile to install storefront and admin in test app
• Change license from AGPL-3.0 to MIT
• Add gemspec metadata (bug_tracker_uri, changelog_uri, etc.)
• Rename .dependabot.yml to proper path

Test plan

• bundle install completes successfully
• bundle exec rake test_app generates dummy app and runs migrations
• bundle exec rspec passes (26 examples, 0 failures, 99.23% coverage)

🤖 Generated with Claude Code

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch update-dev-setup-and-ci

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