Feature/notify

[DevalGarg129]

🚀 Description

Implemented a persistent in-app notification system for Civix.

✨ Features Added

• Added Notification MongoDB schema
• Created secure notification REST APIs
• Added JWT-protected notification routes
• Implemented unread/read notification handling
• Added Notification Bell UI in frontend
• Integrated notification fetching and rendering

📈 Impact

• Reduced manual issue-status checking
• Improved issue update visibility and user engagement
• Established foundation for future real-time and push notifications

[vercel]

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[github-actions]

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