Bootstrap Copilot Studio Gallery

[adilei]

Summary

• launch the Astro-based community gallery for Copilot Studio agents and workflows
• import 16 exploded Power Platform solutions and generate deterministic download bundles
• add scalable search, tags, contributor filtering, featured picks, and lazy-loaded catalog browsing
• render saved workflow canvases and hub-and-spoke agent architecture previews
• add contributor guidance, importer validation, CI, and GitHub Pages deployment

Validation

• npm run import:submissions
• npm test
• npm run check:submissions
• npm run check
• npm run build

Deployment

GitHub Pages is configured to deploy through Actions after this PR merges to main.