Fix parameter schema when schema is a $ref

[jasonblanchard]

Fixes #71

[Copilot]

Pull Request Overview

This PR enhances parameter schema validation to support recursive schema references (like $ref and enums) and adds a new endpoint demonstrating enum validation in path parameters.

• Updated the OpenAPISpec schema to allow full recursive schema definitions for parameters
• Added a new /pets/{size} endpoint with enum validation to the kitchensink example
• Added test coverage for enum validation including invalid values

Reviewed Changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
packages/openapi-typescript-server-runtime/src/schema.ts	Replaced inline parameter schema object with recursive Schema type to support $ref and enum validation
examples/kitchensink/openapi.yaml	Added new PetSize enum schema and /pets/{size} endpoint demonstrating enum path parameter
examples/kitchensink/gen/server.ts	Generated server types for the new listPetsBySize operation
examples/kitchensink/gen/schema.d.ts	Generated TypeScript types for the new endpoint and PetSize enum
examples/kitchensink/app.test.ts	Added test coverage for new endpoint including enum validation
examples/kitchensink/api.ts	Added unimplemented handler stub for new endpoint

[jasonblanchard]

This was the bug. It's not always a string, it can be any Schema.