feat(demo): mirror PHP showcase modules

[lam0819]

Summary

• Mirrors the Shop, Blog, and HR showcase capability matrix with PHP resources.
• Adds reusable resource list/form/view mount points, infolists, actions, tabs, validation, factories, and random seed data.
• Keeps the dashboard data-driven from PHP and defaults new installations to light mode.

Validation

• composer validate --strict
• composer lint:check
• composer types:check
• php artisan migrate:fresh --seed --force
• php artisan test --compact (28 tests, 695 assertions)
• pnpm run format:check
• pnpm run lint:check
• pnpm run types:check
• pnpm run build
• php artisan inlay:doctor --production