fix: disable root path check when serve is false

[nimesh0505]

Summary

This MR addresses the issue #460 where the checkRootPathForErrors function still requires a valid path to root even when serve: false is set.

Changes

• Disabled checkRootPathForErrors when serve: false.
• Added a unit test to confirm that the root path check is bypassed when serve: false.

Tests

• Added a test in test/static.js to verify that checkRootPathForErrors is not called when serve: false.

This fix allows users to use the sendFile decorator without needing to serve static files, as requested.

Checklist

• [x] run npm run test and npm run benchmark
• [x] tests and/or benchmarks are included
• [ ] documentation is changed or added
• [x] commit message and code follows the Developer's Certification of Origin and the Code of conduct