chore(deps): bump Rsbuild 1.6.0-beta.0

[Timeless0911]

Summary

https://github.com/web-infra-dev/rsbuild/releases/tag/v1.6.0-beta.0

Related Links

Checklist

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

[Copilot]

Pull Request Overview

This PR bumps the @rsbuild/core dependency from version ~1.5.17 to 1.6.0-beta.0 across the entire codebase to adopt the latest beta release.

• Updates @rsbuild/core dependency version in all package.json files
• Updates test snapshots to reflect changes in Rsbuild's default configuration
• Maintains consistency across all project templates and examples

Reviewed Changes

Copilot reviewed 26 out of 27 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
website/package.json	Updates Rsbuild core dependency for website build
tests/package.json	Updates Rsbuild core dependency for test environment
tests/integration/node-polyfill/*/package.json	Updates Rsbuild core dependency in integration test packages
tests/integration/asset/index.test.ts	Updates test snapshot to match new JSON import behavior
packages/plugin-dts/package.json	Updates Rsbuild core dependency for DTS plugin
packages/create-rslib/template-*/package.json	Updates Rsbuild core dependency in all project templates
packages/create-rslib/fragments/tools/*/package.json	Updates Rsbuild core dependency in template fragments
packages/core/tests/snapshots/config.test.ts.snap	Updates configuration snapshot with new publicDir default
packages/core/package.json	Updates Rsbuild core dependency for main package
examples/module-federation/*/package.json	Updates Rsbuild core dependency in example projects

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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