fix: query parameters are lost when proxying requests in a sandbox router

[xiaoj655]

The original implementation only forwarded the path, causing requests like /api/data?page=1&size=10 to arrive at the backend as /api/data, and the query parameters were lost.

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: xiaoj655
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• ✅ login: xiaoj655 / name: Kailong Jiang (f696744)

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