fix(core): output.assetsInclude adds a rule but not exposes public api

[SoonIter]

Summary

not regular

should be ${type}-asset-url

font  font-asset-url
additional-assets  additional-assets-asset-url

Related Links

for Rslib Asset
web-infra-dev/rslib#684

Checklist

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

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