Add External Social Media Links to Profile Screen

### 🚀 The feature

in profile screen we are only showing basic information of a user(like name,username etc) how about we can also lets a user to add his/her
social media links similar to apps like discord ,twitter ,instagram Display social media icons/buttons on the profile screen that open the corresponding external links.
we can also make sure that only valid URLs are accepted.for this we also have to update backend with a additional url field
we will modify the Profile Screen UI in Flutter to display clickable icons for the supported social media platforms.

### Motivation, pitch

i would like users to be able to link their external social media accounts (such as Twitter, Instagram, LinkedIn, etc.) to their profile.Currently, profiles only display basic information, which limits user connectivity and engagement.y adding social media links, users can share their other platforms, making profiles more interactive

- this video reagrding limitations like only 7 links are allowed

- a video regarding how the feature will get stored in the database and how it will work completely

https://github.com/user-attachments/assets/6a211eb8-b119-4a29-a5f9-4d0e0354fdee