[Backend] Log non-sensitive env vars on startup #331

[Rajkoli145]

Overview :

This PR improves troubleshooting by logging non-sensitive configuration parameters (e.g., PORT, RUST_ENV, RUST_LOG, CORS_ALLOWED_ORIGINS) during the server startup process.

Changes

• Logging: Added tracing::info! statements in server/src/main.rs to display the application's configuration after it is loaded.
• Security: Strictly ensured that sensitive environment variables, specifically DATABASE_URL, are NOT logged to the console or log files.

Verification

The server starts normally and displays the following configuration logs:

INFO agora_server: Configuration: PORT=3001
INFO agora_server: Configuration: RUST_ENV=development
INFO agora_server: Configuration: RUST_LOG=info
INFO agora_server: Configuration: CORS_ALLOWED_ORIGINS=http://localhost:3000,http://localhost:5173
No sensitive information (database credentials, secrets) is visible in the logs.

closes #331

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