Treeshake xr module import.

[dumganhar]

Re: #18222

Changelog

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Continuous Integration

This pull request:

• needs automatic test cases check.

  Manual trigger with @cocos-robot run test cases afterward.

• does not change any runtime related code or build configuration

  If any reviewer thinks the CI checks are needed, please uncheck this option, then close and reopen the issue.

---

Compatibility Check

This pull request:

• changes public API, and have ensured backward compatibility with deprecated features.
• affects platform compatibility, e.g. system version, browser version, platform sdk version, platform toolchain, language version, hardware compatibility etc.
• affects file structure of the build package or build configuration which requires user project upgrade.
• introduces breaking changes, please list all changes, affected features and the scope of violation.

[github-actions]

Code Size Check Report

Wechat (WASM)	Before	After	Diff
2D Empty (legacy pipeline)	1001928 bytes	1001928 bytes	✅ 0 bytes
2D All (legacy pipeline)	2411694 bytes	2409169 bytes	👍 -2525 bytes
2D All (new pipeline)	2501177 bytes	2498652 bytes	👍 -2525 bytes
(2D + 3D) All	5239910 bytes	5237385 bytes	👍 -2525 bytes

Web (WASM + ASMJS)	Before	After	Diff
(2D + 3D) All	16463125 bytes	16460600 bytes	👍 -2525 bytes

Interface Check Report

This pull request does not change any public interfaces !

[dumganhar]

@cocos-robot run test cases

[github-actions]

@dumganhar, Please check the result of run test cases:

• Test Platform: PR-Test
• Editor Version: v3.8.6
• Task Result: FAIL
• Task URL: https://cctest.cocos.org/#/reportview/PR-TEST/5915dab4-a2d4-4d87-8e3c-cf6645c8497d/-1
• GitHub Action: https://github.com/cocos/cocos-engine/actions/runs/13307305469

Task Details

Platform	build	boot	runned	crashScene	FailScene
web-mobile	PASS	PASS	PASS
ios	PASS	PASS	FAIL		reflection-probe
mac	PASS	PASS	FAIL		reflection-probe

[github-actions]

@dumganhar, Please check the result of run test cases:

• Test Platform: PR-Test
• Editor Version: v3.8.6
• Task Result: PASS
• Task URL: https://cctest.cocos.org/#/reportview/PR-TEST/a5d684ac-01f9-4cf3-a82b-166b226b878c/-1
• GitHub Action: https://github.com/cocos/cocos-engine/actions/runs/13307305469

Task Details