feat: concepts

[mirecad]

Summary

• Added concepts.ts module that discovers and indexes all DotVVM concept documentation pages via the GitHub API (categories, subcategories, standalone pages)
• Added fetchConceptDocs to fetcher.ts for fetching raw concept markdown with relative image reference handling
• Added two new MCP server items in index.ts:
  • Resource dotvvm://concepts — returns a formatted index of all concept pages (data binding, routing, validation, viewmodels, security, layout, control development, etc.)
  • Tool get_dotvvm_concept_docs — fetches documentation for a specific concept page by path (e.g. data-binding/value-binding, routing/overview)

Test plan

• Read the dotvvm://concepts resource and verify the index lists expected categories and pages
• Call get_dotvvm_concept_docs with a valid path (e.g. data-binding/value-binding) and verify the docs are returned
• Call get_dotvvm_concept_docs with an invalid path and verify the "did you mean" suggestions are returned
• Verify caching works — second call should not hit GitHub API

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