feat: add version info to health check and fix healthz endpoint
- Fixed health check to use correct /healthz endpoint instead of /health - Added MCP version (mcpVersion) and supported n8n version (supportedN8nVersion) to health check response - Added versionNote field with instructions for AI agents about manual version verification - n8n API limitation: instance version cannot be determined automatically - Updated axios usage for healthz endpoint access with proper error handling
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