fix(cli): improve command usage display

[chenjiahan]

Summary

The usage section now shows the command format in green for better visibility.

Before

After

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[Copilot]

Pull Request Overview

This PR updates the CLI usage message to clarify that both command and options are optional parameters by changing the angle brackets (<>) to square brackets ([]). This better represents the actual CLI behavior where commands are optional (defaulting to the dev command).

• Updated the usage documentation in both English and Chinese documentation files to reflect optional command syntax
• Modified the CLI help output formatting logic to explicitly set the usage line with correct bracket notation

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
website/docs/zh/guide/basic/cli.mdx	Updated Chinese documentation to show command as optional parameter
website/docs/en/guide/basic/cli.mdx	Updated English documentation to show command as optional parameter
packages/core/src/cli/commands.ts	Added logic to format the Usage section with correct optional parameter syntax

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