feat: migrate app from Streamlit to Flask framework

[ManthanTerse]

🚀 Description

Migrated the application from Streamlit to Flask to improve flexibility, scalability, and backend control.

🔧 Type of Change

• New feature
• Refactoring

🧠 Key Changes

• Replaced Streamlit UI with Flask routes and templates
• Updated app structure for backend-driven rendering
• Improved control over request/response handling

🧪 Testing

• Ran Flask server locally
• Verified routes and chatbot functionality
• Ensured no breaking issues in core features

⚠️ Notes

• This is a major structural change
• Reviewers may need to test locally

✅ Checklist

• Code follows project structure
• Self-reviewed changes
• No unnecessary files added

[ManthanTerse]

Hello @adhithim09 !
The work is done ...
Please review it and merge!

Thankyou!