fix: allow to disable CSS minification if CSS is inlined

[chenjiahan]

Summary

Should allow to disable CSS minification (output.minify: false) if CSS is inlined (via output.injectStyles: true or the ?inline query).

export default defineConfig({
  output: {
    minify: false,
    injectStyles: true,
  },
});

Checklist

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

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