feat: Allow running multiple swaggers in a single app

[sjorobekov]

The previous approach of serving the swagger page will run a single swagger documentation.

According to the docs updated serving documentation using .serveFiles

[Copilot]

Pull request overview

This PR updates the swagger-ui-express integration to support serving multiple swagger documents in a single application by replacing the serve middleware with serveFiles, as recommended in the swagger-ui-express documentation.

Changes:

• Migrated from serve to serveFiles middleware for swagger-ui-express to enable multiple swagger document support
• Consolidated TypeScript module augmentation for RouteContract from a separate @typing/validator.d.ts file into src/types.ts
• Updated zod devDependency version and corrected package license metadata

Reviewed changes

Copilot reviewed 4 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/openapi-registry.ts	Updated swagger-ui-express imports and middleware usage from serve to serveFiles to enable multiple swagger document support; optimized schema retrieval by capturing it once during mount handler execution
src/types.ts	Added module augmentation for @gravity-ui/expresskit RouteContract interface, previously located in src/@typing/validator.d.ts
src/@typing/validator.d.ts	Removed file as module augmentation was consolidated into src/types.ts
src/index.ts	Added import for ./types to ensure module augmentation declarations are included when package is imported
package.json	Updated zod devDependency version and corrected license field from ISC to MIT
package-lock.json	Updated lock file entries for zod version and license metadata

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