Fix Google authentication configuration

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📌 Description

Fixes

1. Configured Firebase Web App
2. Enabled Google Authentication in Firebase
3. Added frontend Firebase environment variables
4. Connected backend with MongoDB Atlas
5. Fixed Google login configuration issue

🔗 Related Issue

Closes #1182 #1145 #1141

🛠 Changes Made

1. Added Firebase configuration to frontend environment setup
2. Enabled Google Sign-In authentication provider
3. Configured MongoDB Atlas connection for backend
4. Updated authentication setup and environment variables
5. Verified successful Google login flow locally

📸 Screenshots (if applicable)

✅ Checklist

• Code runs locally
• Followed project structure
• No console errors
• Properly tested changes
• Linked the issue

🚀 Notes for Reviewers

Google authentication setup has been fully configured and tested locally. MongoDB backend connection and Firebase integration are functioning correctly.