Adds a new `/route/validate` endpoint that accepts YAML-encoded route
configurations for validation. Supports both synchronous HTTP requests
and real-time streaming via WebSocket for interactive validation workflows.
Changes:
- Implement Validate handler with YAML binding in route/validate.go
- Add WebSocket manager for streaming validation results
- Register GET/POST routes in handler.go
- Regenerate Swagger documentation
- These changes makes the API incombatible with previous versions
- Added new types for error handling, success responses, and health checks.
- Updated health check logic to utilize the new types for better clarity and structure.
- Refactored existing handlers to improve response consistency and error handling.
- Updated Makefile to include a new target for generating API types from Swagger.
- Updated "new agent" API to respond an encrypted cert pair
