chore: Add startup validation for required .env variables

[AlAfiz]

Description

If the server starts without a PORT defined, it might crash unexpectedly later. We should check this immediately when the app boots.

Requirements

• At the top of index.js or server.js, check if process.env.PORT exists.
• If it does not exist, use console.warn() to print a message saying it is falling back to a default port (e.g., 3000).

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[ReinaMaze]

@ReinaMaze has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

Gm , can I get assigned to this issue ?

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[devxsameer]

@devxsameer has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

Hi, I’d like to take this on.

I’ll add startup validation for process.env.PORT at boot, log a clear console.warn() if it’s missing, and safely fall back to a default (3000). I’ll also ensure the logic is centralized and easy to extend later for additional required env variables.

ETA: 30–45 minutes.

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