fix: failed to load MF remote modules when using server.base

[chenjiahan]

Summary

Fix failed to load MF remote modules when using server.base.

The default dev.assetPrefix is set to the value of server.base, and Rsbuild should replace it with dev.assetPrefix: true to ensure that the remote module's assets can be requested by consumer apps with the correct URL.

Related Links

resolve #3780

Checklist

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

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Lighthouse	1 paths audited Performance: 80 (🟢 up 10 from production) Accessibility: 97 (no change from production) Best Practices: 100 (no change from production) SEO: 100 (no change from production) PWA: 60 (no change from production) View the detailed breakdown and full score reports

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