docs(environment-api): clarify loadBundle behavior and usage

[chenjiahan]

Summary

Explain that loadBundle cannot be called within the onAfterDevCompile hook.

Checklist

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

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[Copilot]

Pull Request Overview

This PR enhances the documentation for the loadBundle method in the Environment API by providing more detailed explanations and important usage constraints.

• Expanded the description of loadBundle to better explain its purpose and typical use cases
• Added critical timing information about when loadBundle resolves (after build completion and onAfterDevCompile hook)
• Documented the limitation that loadBundle cannot be called within the onAfterDevCompile hook

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
website/docs/en/api/javascript-api/environment-api.mdx	Enhanced English documentation for loadBundle with detailed description and usage constraints
website/docs/zh/api/javascript-api/environment-api.mdx	Enhanced Chinese documentation for loadBundle with detailed description and usage constraints

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