feat: expose streak data in API response

[Yashaswini-K-P]

Description

This PR integrates the pre-computed streak data into the user profile API response. Instead of calculating streaks on-the-fly, the API now directly serves the streak object (containing current, longest, and lastUpdated values) directly from the persistent JSON storage. This ensures consistent data retrieval and improves response performance.

Linked Issue

Fixes #51

Changes Made

• Updated fetchUserInfo.js to extract the streak object from the user's JSON data file.
• Included the streak object in the returned user information object, ensuring it is accessible via the API.
• Maintained backward compatibility for users who do not yet have the updated streak schema.

Type of Change

• New feature
• 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 by running npx prettier --write . before submitting
• I am submitting my PR from a dedicated feature/* branch, not the main branch
• 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

N/A

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