chore: add use-modern-go skill from JetBrains

[gzliudan]

Add the JetBrains go-modern-guidelines skill to .agents/skills/use-modern-go/ so it is available as a project-level skill in this repo.

• Invoke with the use-modern-go skill (slash command or use_skill).
• Provides modern Go coding guidelines checked against a target Go version via scripts/run-tool.sh list --go-version <ver>.
• .agents/ is globally gitignored, so the directory is force-added (git add -f); it remains tracked thereafter.

This is tooling only — no runtime/source changes.

Summary by CodeRabbit

• New Features
  • Added guidance for applying modern Go guidelines before editing Go code, including reviewing applicable recommendations and explaining exceptions.
  • Added Linux/macOS and Windows launchers that install and run the versioned guidelines tool, with support for development builds.

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