feat: Add student name field to activity sign-up form

[syed-dillu]

Description

This PR enhances the student sign-up functionality for extracurricular activities by adding a required "Student Name" field to the sign-up form.

Changes Made

Frontend Updates

• HTML (index.html): Added a new "Student Name" input field as the first field in the sign-up form
• JavaScript (app.js): Updated the form submission handler to capture the student name and pass it to the backend API

Backend Updates

• API Endpoint (app.py):
  • Updated the /activities/{activity_name}/signup endpoint to accept a name parameter
  • Changed participant storage from simple email strings to objects containing both name and email
  • Updated sign-up response message to include the student's name

Data Structure

• Migrated participant data from email-only format to structured objects: {"name": "...", "email": "..."}
• Updated all existing activity participants with names

New Activities

• Added "Art Club" activity with schedule and participant information
• Added "Cricket Club" activity with schedule and participant information

Benefits

• Captures complete student information during sign-up
• Improves data collection for activity tracking and communication
• Provides better user experience by showing who is registered for each activity

Files Modified

• src/app.py - Backend API and data model
• src/static/index.html - Form UI
• src/static/app.js - Frontend logic
• src/static/styles.css - Styling updates

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