chore: add environment validation script and npm validate:env command

[KGFCH2]

What changed

• Added scripts/validate-env.js
• Added validate:env npm script
• Added documentation and helpful output for missing/extra env vars

Why

This improves onboarding and local setup by validating .env.local against the example file, reducing environment-related setup issues.

Testing

• Run npm run validate:env
• Confirm the script detects missing/extra variables correctly

Checklist

• Script exists and is executable
• npm run validate:env passes in a valid env environment
• Error messages are clear for invalid env configs

Closes #39

[vercel]

@KGFCH2 is attempting to deploy a commit to the Harsh Yadav's projects Team on Vercel.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: d7f9cab4-8b2c-483a-a373-7931cbc53d17

📥 Commits

Reviewing files that changed from the base of the PR and between dcfb7ee and 7a9ec46.

📒 Files selected for processing (2)

• gsecure/package.json
• gsecure/scripts/validate-env.js

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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