fix(plugin): preserve inferred responses for enum error statuses

[GiHoon1123]

Fixes #4009

Problem

When @ApiResponse uses an enum status such as HttpStatus.BAD_REQUEST, the Swagger plugin does not resolve the enum value and treats it as a success response.

As a result, the automatically generated 200 response is omitted.

Fix

Pass the TypeScript TypeChecker to the status check and resolve enum members with getConstantValue().

This preserves the existing behavior for numeric statuses and ensures that:

• enum error statuses keep the inferred success response
• enum success statuses suppress the inferred success response

Tests

Added regression coverage for:

• HttpStatus.BAD_REQUEST with an inferred 200 response
• HttpStatus.CREATED suppressing the inferred 200 response

Verified with:

• pnpm test
• pnpm run build
• pnpm run lint

[kamilmysliwiec]

lgtm