fix: YouTube subscriber count is hardcoded and outdated

[iamashishxo]

Fixes #1954

Key changes:
Implemented YouTube Data API integration
Added environment variable configuration
Created reusable YouTube data fetching utilities
Added proper error handling and loading states
Implemented number formatting for subscriber counts (K/M suffixes)

Type of change
Bug fix (non-breaking change which fixes an issue)
New feature (non-breaking change which adds functionality)

How should this be tested

Set up environment variables:
``
YOUTUBE_API_KEY=your_api_key

YOUTUBE_CHANNEL_ID=your_channel_id
``

Test the following scenarios:
Verify subscriber count displays correctly
Verify video count displays correctly
Test with invalid API key (should fail gracefully)
Test loading state appears while fetching data
Verify mobile responsiveness

Mandatory Tasks
Self-reviewed the code
Verified no console errors
Tested multiple viewport sizes

Checklist
My code follows the style guidelines of this project
I have commented my code, particularly in hard-to-understand areas
My changes generate no new warnings
I have checked that my changes don't break existing functionality

Screnshot

After

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