[Backend] Write unit test for health check endpoint

[Yunusabdul38]

Description: Ensure the backend's core uptime check is working correctly by implementing a unit test that verifies the /health endpoint. Tasks:

Implement a test case using Axum's test utilities.
Assert status 200 OK for the health route.
Verify the response body matches the expected JSON format.

[Rajkoli145]

@Rajkoli145 has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

Hi ,
I’d like to work on this issue.

I’ll add a unit test for the health check endpoint, ensuring it validates the expected response and integrates cleanly with the existing test setup.

Happy to align with any preferred testing approach before I begin.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Rajkoli145 to this issue.

[Sundriveauto]

@Sundriveauto has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

pls i will love to work on this issues

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Sundriveauto to this issue.

[drips-wave]

Congratulations, @Sundriveauto! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on March 30, 2026.

🧑‍💻 @Sundriveauto: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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[drips-wave]

This issue has been completed by @Sundriveauto as part of the Stellar Wave Program's 3rd Wave 🥳

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