[Backend] Log non-sensitive env vars on startup

[Yunusabdul38]

Description: Improve troubleshooting by logging the values of non-sensitive configuration parameters (e.g., PORT, NODE_ENV) when the server starts up. Tasks:

Add logging logic in main.rs to display configured variables.
STRICTLY PROHIBIT logging secrets or database URLs.
Test that logs appear on startup.

[Rajkoli145]

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

Hi @Agora-Events,
I’d like to work on this issue.

I’ll add logging for non-sensitive environment variables on startup, ensuring sensitive values are excluded and output remains clean and useful.

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

[drips-wave]

Congratulations, @Rajkoli145! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on March 30, 2026.

🧑‍💻 @Rajkoli145: 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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