Added Api to verify url in client app through tangerine

[faridy-mahvish]

Description

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This PR adds a lightweight verification API endpoint that the client can call during startup to confirm that the backend is a valid Tangerine server. The client uses this endpoint to fail fast and show a clear error message when the server is misconfigured or unsupported.

File Change and Include

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express-app.js

[gemini-code-assist]

Summary of Changes

Hello @faridy-mahvish, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a new API endpoint to enable client applications to verify the application's URL and retrieve basic status information. This standardized verification mechanism, utilizing the .well-known URI, enhances the reliability and trust between client applications and the server by providing a consistent way to confirm the application's identity and operational status.

Highlights

• New API Endpoint for Client Verification: A new GET endpoint, /well-known/tangerine, has been added to the Express application. This endpoint is designed to allow client applications to verify the URL and retrieve essential application details such as appName, version, status, and timestamp in a standardized format.

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[gemini-code-assist]

Code Review

This pull request introduces a new endpoint /.well-known/tangerine to expose basic application information, likely for client-side verification. The implementation is clean and simple. My review includes a minor suggestion to improve code quality by leveraging an existing constant and removing a redundant return statement.