feat(#158): kill detached process on win

[h1alexbel]

In this pull I've implemented kill(port) for killing detached process on windows platform, and enabled accepts_request_in_detached_mode integration test on windows platform.

closes #158

---

PR-Codex overview

The focus of this PR is to add support for killing ports on Windows platform in the CLI integration tests.

Detailed summary

• Added npm install kill-port in justfile
• Added Windows-specific logic for detached process flag in main.rs
• Updated integration tests to handle port killing on Windows platform

✨ Ask PR-Codex anything about this PR by commenting with /codex {your question}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.15%. Comparing base (1bd7585) to head (39e19fd).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #159   +/-   ##
=======================================
  Coverage   83.15%   83.15%           
=======================================
  Files          16       16           
  Lines         285      285           
=======================================
  Hits          237      237           
  Misses         48       48           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[h1alexbel]

@l3r8yJ something gets wrong with exiting of the test:

test tests::accepts_request_in_detached_mode has been running for over 60 seconds

Maybe you do know how to fix that?

[l3r8yJ]

@h1alexbel I think that use killport from npx is not a good idea, i'll refactor a bit this part

[h1alexbel]

@l3r8yJ I will try to check problematic test on real windows then

[h1alexbel]

@l3r8yJ I checked out this branch on windows. It looks like server starts in blocking mode, but it should be detached. Probably some flags are misused