Description

This PR introduces a new backend API endpoint to fetch historical LeetCode progress data for a specific student.

The endpoint reads daily snapshot files from the GitHub repository and constructs a time-series response showing a student's coding progress over time.

This enables frontend features like progress graphs and performance tracking.

Linked Issue

Fixes #7

Changes Made

Added new API endpoint:

GET /api/student/:username
Integrated GitHub API to fetch daily JSON snapshot files
Extracted user-specific data across multiple days
Constructed a structured time-series response format
Sorted historical data by date before returning response
Handled missing user data safely across files

Type of Change

• Bug fix
• New feature
• UI/Visual update
• Documentation update
• Refactor

Testing

• Tested locally
• Tested on mobile viewport (if applicable)
• No console errors introduced

Checklist

• My code follows the project's coding style
• I have formatted my code locally using Prettier
• I have performed a self-review of my code
• My changes generate no new warnings or errors
• I have updated documentation if required
• I have linked the relevant issue

Screenshots / Screen Recording