feat: add helmet security headers via separate config module - Fixes …

[jikrana1]

🛡️ Issue: #198 - Add Helmet Middleware for HTTP Security Headers

📝 Summary

This PR adds the helmet middleware to improve security by setting secure HTTP headers. The configuration is isolated in a dedicated module (src/config/helmet.js).

✨ Changes Made:

• Created: src/config/helmet.js – dedicated module for Helmet configuration.
• Refactored: app.js now imports and uses helmetMiddleware.
• Verified: CORS, Socket.IO, and all existing endpoints work without any issues.

🔒 Security Headers Added:

• X-Content-Type-Options, X-Frame-Options, X-XSS-Protection, Strict-Transport-Security, Referrer-Policy.

✅ Benefits:

• Follows security best practices.
• Configuration is centralized and easy to customize later.

🔗 Related Issue:

Closes #198

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🔨 Latest commit	f54387e

[jikrana1]

Hi @imanchalsingh ,
I contributed to this project and PR was merged, but I don't see my name in the contributors list.
Could you please add it when you get a chance?
Thanks!

[imanchalsingh]

Hi @imanchalsingh , I contributed to this project and PR was merged, but I don't see my name in the contributors list. Could you please add it when you get a chance? Thanks!

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