docs(linter): update JS plugins docs to include @oxlint/plugins package

[overlookmotel]

oxc-project/oxc#18791 added eslintCompatPlugin function to convert a plugin using alternative createOnce API to an ESLint-compatible plugin.

oxc-project/oxc#18824 added @oxlint/plugins package, which contains this eslintCompatPlugin function.

Update the docs to reflect these changes.

Note: Not all these changes are yet in an Oxlint release, but @oxlint/plugins has been published to NPM, so we don't need to wait for next Oxlint release before updating the docs. The new instructions work already.

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[overlookmotel]

• docs(linter): update JS plugins docs to include @oxlint/plugins package #865 👈 (View in Graphite)
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[Copilot]

Pull request overview

This PR updates the JavaScript plugins documentation to reflect the new @oxlint/plugins package and its eslintCompatPlugin function, replacing the previous defineRule and definePlugin API.

Changes:

• Updated import statements from oxlint to @oxlint/plugins package
• Replaced defineRule/definePlugin wrapper functions with eslintCompatPlugin that wraps the entire plugin
• Updated section headers, cross-references, and explanations to reflect the new API
• Added guidance about adding @oxlint/plugins as a runtime dependency

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