docs: update output.module for web target

[chenjiahan]

Summary

• Add documentation for using ES modules format in web applications and clarify the usage for both web and node targets.
• Update version history to reflect new web target support in v1.6.0.

Related Links

#6332

Checklist

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

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[Copilot]

Pull Request Overview

This PR updates documentation to reflect expanded support for output.module configuration, which now works with both web and Node.js targets. The main change is promoting the web target support from experimental to stable status (v1.6.0).

Key Changes:

• Documentation now covers both web and Node.js application scenarios for ES module output
• Removed experimental warning for web target in the core ESM plugin
• Added version history entry documenting web target support in v1.6.0

Reviewed Changes

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

File	Description
website/docs/zh/config/output/module.mdx	Added web application section, reorganized content to separate web and Node.js use cases, updated version history
website/docs/en/config/output/module.mdx	English translation of the same documentation updates
packages/core/src/plugins/esm.ts	Removed experimental warning for web target usage

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