Issue #9: Implement Notifications System #10
Description
Description:
Add push notifications for likes, comments, follows, and mentions.
Types of Notifications:
- Someone liked your post
- Someone commented on your post
- Someone followed you
- Someone mentioned you in a post/comment
- Someone replied to your comment
Technical Requirements:
- Firebase Cloud Messaging (FCM) for push notifications
- In-app notification center
- Notification preferences/settings
- Read/unread status
- Mark all as read