fix(node): fix data race on httpConfig.prefix #32047

[gzliudan]

Proposed changes

This fixes a data race when accessing the httpConfig.prefix field. This field can be modified while the server is running through enableRPC. The fix is storing the prefix in the handler, which is accessed through the atomic pointer.

Ref: ethereum#32047

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• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
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• CICD Improvement

Impacted Components

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• Account
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• Geth
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Checklist

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• This PR has sufficient test coverage (unit/integration test) OR I have provided reason in the PR description for not having test coverage
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• Tested the backwards compatibility.
• Tested with XDC nodes running this version co-exist with those running the previous version.
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[Copilot]

Pull request overview

Fixes a data race on the RPC path prefix by snapshotting the configured prefix into the immutable RPC handler stored in an atomic pointer, so request handling no longer reads mutable server config concurrently.

Changes:

• Add prefix to rpcHandler and use it for request routing (checkPath) instead of reading httpConfig/wsConfig during ServeHTTP.
• Replace atomic.Value handler storage with typed atomic.Pointer[rpcHandler] for safer, simpler nil handling.

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