Fix: Ensure port variable is defined before usage in route handler

[codeautopilot]

Resolves #10

This pull request fixes the bug where the port variable was used before being defined in the generate-proxy-url route handler. The port variable is now declared and initialized before the route handler to prevent runtime errors.

[deepsource-io]

Here's the code health analysis summary for commits d1230a9..d858d25. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
JavaScript	✅ Success	🎯 1 occurence resolved	View Check ↗

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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