Add environment variable validation with proper error messages for all required config

[nanaf6203-bit]

Problem

validate-env.ts only checks if env vars exist without validating format, range, or compatibility. Missing JWT_SECRET silently uses hardcoded defaults.

Expected Outcome

Clear, actionable error messages at startup when configuration is invalid.

Acceptance Criteria

• Joi or Zod schema validation for all required env vars
• Type coercion and defaults handled explicitly
• Production-specific enforcement
• Clear error messages for specific misconfigured variables

Files Affected

src/utils/validate-env.ts, src/main.ts, src/app.module.ts, package.json

Difficulty

Easy

Estimated Effort

Small (4-6 hours)

Labels

security, devops, enhancement

[ummarig]

@ummarig has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hi, I investigated the relevant modules and have a clear strategy for implementing the required changes. Kindly assign this issue to me.

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

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

🧑‍💻 @ummarig: 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.

Warning

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[drips-wave]

This issue has been completed by @ummarig as part of the Stellar Wave Program's 7th Wave 🥳

😎 @ummarig: You earned 200 Points for completing this issue! After the current Wave ends, you'll be eligible for a percentage of the Wave's reward pool based on the percentage of total points you've earned. Learn more here. You can also Leave a review to share your experience working on this issue.

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