feat: add OpenAPI/Swagger UI support with interactive API documentation
- Add OpenAPI 3.0 specification builder with fluent API - Add Swagger UI integration for interactive API documentation - Add comprehensive OpenAPI data structures (schemas, parameters, responses, etc.) - Add swagger_demo.v example with Pet Store API demonstration - Use global variables for shared mutable state in demo handlers - Add property-based tests for OpenAPI serialization and validation - Update README with Swagger UI documentation
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