feat: compatible for rspack 2.0

[JSerFeng]

rspack 2.0 deprecate experiments.css, should explicitly specifiy the css config, should add a default rule to specify css type

[gemini-code-assist]

Summary of Changes

Hello @JSerFeng, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request updates the Rspack configuration to align with Rspack 2.0's changes regarding CSS processing. It introduces an explicit default rule for CSS files, ensuring they are correctly handled by the bundler. This change is crucial for maintaining build functionality and compatibility with the newer Rspack version.

Highlights

• Rspack 2.0 Compatibility: The Rspack configuration has been updated to ensure compatibility with Rspack 2.0, specifically addressing changes in how CSS is processed.
• Explicit CSS Rule: A new module.defaultRules entry has been introduced to explicitly define the handling of .css files, setting their type to css/auto.

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[gemini-code-assist]

Code Review

This pull request updates the Rspack configuration for compatibility with version 2.0 by adding a default rule for CSS files. The change is correct, but it leaves a deprecated experiments.css configuration in the file. I've suggested removing it to fully complete the update and avoid using deprecated features.