9300d4a83b
Add License module with service, guard, and controller to enable runtime license validation for Enterprise Edition features. Components: - LicenseService: validates license keys against remote API with caching - LicenseGuard: protects EE routes using @RequireLicense() decorator - LicenseController: provides /license/status, /license/verify endpoints - Configuration: add license.env vars (LICENSE_KEY, LICENSE_API_URL, etc.) This provides basic runtime protection that can be enhanced later with deployment key pattern for stronger protection. Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>