feat: expose defaultAllowedOrigins from core

[chenjiahan]

Summary

Exposes defaultAllowedOrigins from core to allow users to easily add additional origins while keeping the default localhost origins.

import { defaultAllowedOrigins } from '@rsbuild/core';

export default {
  server: {
    cors: {
      origin: [defaultAllowedOrigins, 'https://example.com'],
    },
  },
};

Checklist

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

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