Support standard OpenAPI HTTP methods

[kriptoburak]

Summary

• Cover every standard OpenAPI path operation method in overview generation.
• Reuse one shared method list for operationId lookup and available-ID errors.
• Keep exact route lookup compatible by choosing the first method on the path.

Validation

• npm install --ignore-scripts --no-save --no-package-lock
• npm install --ignore-scripts --no-save --no-package-lock typescript @types/js-yaml
• ./node_modules/.bin/tsc --noEmit --target ES2022 --module ESNext --moduleResolution Bundler --lib ESNext,WebWorker --skipLibCheck worker.ts
• git diff --check

Note: npm pack is blocked before packaging because the existing package.json has no name or version.