fix(plugin-api-docgen): too much apiDocMap clone in pageData cause performance issue in runtime

[SoonIter]

Summary

fix(plugin-api-docgen): too much apiDocMap clone in pageData cause performance issue in runtime

#2523

Related Issue

Checklist

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

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[Copilot]

Pull Request Overview

This PR addresses a performance issue in the plugin-api-docgen by eliminating excessive cloning of the apiDocMap in pageData during runtime. The fix replaces the runtime page data approach with a compile-time global variable injection.

• Moves apiDocMap from runtime pageData to a compile-time global variable
• Removes the extendPageData hook that was creating multiple copies of apiDocMap
• Uses webpack's define plugin to inject the apiDocMap data at build time

Reviewed Changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 2 comments.

File	Description
packages/plugin-api-docgen/static/global-components/API.tsx	Updates component to use global variable instead of pageData, reorganizes imports
packages/plugin-api-docgen/src/index.ts	Removes pageData extension, adds global variable definition via builderConfig
packages/plugin-api-docgen/package.json	Removes unnecessary index.d.ts from package files

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