fix: migrate plugin import to standalone package

[itaymendel]

resolves #39

Summary by CodeRabbit

• Changed
  • Migrated plugin imports to the @oxlint/plugins package.
  • Bumped oxlint dependency to ^1.48.0 and added @oxlint/plugins ^1.48.0 as a dev dependency.
  • Raised peer dependency requirement for @oxlint/plugins to >=1.43.0.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

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📝 Walkthrough

Walkthrough

This PR migrates imports from oxlint/plugins to the standalone @oxlint/plugins, updates package dependency entries (oxlint → ^1.48.0 and adds @oxlint/plugins), and adds a changelog note documenting the migration for compatibility with oxlint >= 1.45.0. No runtime logic changes.

Changes

Cohort / File(s)	Summary
Changelog CHANGELOG.md	Added an Unreleased note documenting migration of plugin imports from oxlint/plugins to @oxlint/plugins.
Dependency config package.json	Replaced/updated devDependency on oxlint to ^1.48.0 and added @oxlint/plugins ^1.48.0; peerDependencies updated to require @oxlint/plugins >=1.43.0.
Import updates — source files src/index.ts, src/types.ts, src/extraction/variable-tracker.ts, src/rules/complexity.ts, src/rules/max-cognitive.ts, src/rules/shared.ts	Replaced imports from oxlint/plugins with @oxlint/plugins (e.g., definePlugin, defineRule, ESTree types and re-exports). No logic or API signature changes.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 I hopped through code with careful paws,

Swapped old plugin paths without a pause,
From oxlint's nest to a standalone den,
Now imports fit with the newest ken,
A tiny hop — compatibility again!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely summarizes the main change: migrating plugin imports from oxlint/plugins to the standalone @oxlint/plugins package.
Linked Issues check	✅ Passed	The PR successfully addresses all coding objectives from issue #39: imports updated to @oxlint/plugins across all source files, and package.json updated with the new dependency.
Out of Scope Changes check	✅ Passed	All changes are directly related to the migration objective; no unrelated modifications detected in the changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/migrate-plugin-imports

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