fix: emit Node-compatible ESM output

[zombieJ]

Summary

• emit fully specified relative JavaScript imports and exports for native ESM output
• complete legacy package subpaths such as dayjs/plugin/weekday while preserving packages that define exports
• align declaration specifiers and add an ESM package marker to the output directory
• activate only when exports.import targets the Father ESM output, leaving legacy main/module packages unchanged

Context

This addresses the shared build behavior behind react-component/picker#1002 and react-component/picker#1004 in the Father plugin instead of requiring each package to maintain a post-build script.

Validation

• ut lint:es
• ut build
• ut test (9 tests)
• rebuilt @rc-component/picker from master and verified native Node ESM imports, CommonJS require, and a TypeScript NodeNext consumer; the lib output remained identical
• ran antd master with its picker aliases pointed at the rebuilt es output; Dumi/Webpack compiled 16,828 modules and both the DatePicker page and /umi.js returned HTTP 200

[coderabbitai]

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Configuration used: Organization UI

Review profile: CHILL

Plan: Team

Run ID: 3f89746d-bcd2-4f0b-b63e-71b71b800211

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