docs: align dev config JSDoc with documentation

[chenjiahan]

Summary

• update dev configuration JSDoc to match current documentation defaults
• clarify lazy compilation, asset prefix, CLI shortcuts, and watch files comments

Testing

• not run

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Codex Task

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[Copilot]

Pull Request Overview

This PR updates JSDoc comments in the development configuration types to align with the current documentation, improving clarity and consistency for developers using these APIs.

• Added comprehensive JSDoc documentation for WatchFiles type properties
• Clarified browserLogs description to mention both window errors and Promise rejections
• Added default value annotations for several properties to match documentation
• Updated lazyCompilation description and default value to reflect current behavior

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