feat: add lab plugin with routes.json and skill integration

[reldothescribe]

This PR adds a new Lab plugin that integrates with the ethpandaops/lab routes.json and SKILL.md for deep linking.

Features

• Fetch and cache lab routes.json from ethpandaops/lab repository
• Parse SKILL.md for deep linking patterns
• Python API for:
  • List all available Lab routes by category
  • Generate deep links for specific routes (slots, epochs, forks, etc.)
  • Get route metadata (description, parameters, etc.)
  • Build URLs for specific networks (mainnet, sepolia, holesky, hoodi)

Files Added

• • Plugin configuration
• • Main plugin implementation
• • Example queries loader
• • Example queries
• • Python module for sandbox

Files Modified

• • Register lab plugin
• • Add lab to lazy imports
• • Copied Python module

Usage

The plugin follows the same pattern as the Dora plugin and uses cartographoor for Lab instance discovery.