feat(daffio, storefront-examples): render storefront component examples in docs

[xelaint]

PR Checklist

• Commit message follows our contributing guidelines
• Tests added/updated (for bug fixes/features)
• Documentation added/updated (for bug fixes/features)

PR Type

• Bug fix
• Feature
• Style update
• Refactor
• Test
• Build
• CI
• Docs
• Performance
• Other (please describe)

Current behavior

Fixes: #4359

New behavior

• Add example viewers to storefront carousel and theme-toggle READMEs
• Add content providers for storefront examples (carousel, theme-toggle)
• Register storefront examples in the shared design routes factory so they are available across both design and storefront doc sections
• Update DaffioExampleViewerComponent to resolve source file paths dynamically using the active section (design vs storefront) instead of hardcoding "design"
• Fix carousel example template (remove invalid daffCardHeader usage)
• Update storefront-examples public APIs to export content providers
• Add @daffodil/docs as a dev dependency to @daffodil/storefront-examples

Breaking change?

• Yes
• No

Additional context