Calculate the number of deactivated followers in group/user

[konard]

🎯 Summary

This PR implements functionality to calculate the number of deactivated followers in VK groups or for individual users, addressing issue #37.

✨ Features

• Universal Script: Works for both VK groups and individual users
• Comprehensive Counting: Counts deactivated users (banned/deleted status)
• Detailed Statistics: Provides total count, deactivated count, active count, and percentage
• Rate Limiting: Includes proper API rate limiting to avoid limits
• Batch Processing: Efficiently processes large follower lists in batches

📁 Files Added

• count-deactivated-followers.js - Main script for counting deactivated followers
• __tests__/count-deactivated-followers.test.js - Unit tests for the functionality
• experiments/test-count-deactivated-followers.js - Experiment script for validation

🚀 Usage

# Count deactivated members in a group
node count-deactivated-followers.js 54530371 group

# Count deactivated followers for a user  
node count-deactivated-followers.js 123456789 user

🔧 Technical Implementation

• Uses VK API groups.getMembers for group analysis
• Uses VK API users.getFollowers for user analysis
• Filters users with deactivated field set to 'banned' or 'deleted'
• Processes up to 100,000 followers with 1000-item batches
• Includes 200ms delay between API calls for rate limiting

📊 Sample Output

=== RESULTS ===
Target: group 54530371
Total members: 10000
Active members: 8500
Deactivated members: 1500
Deactivated percentage: 15.00%

✅ Testing

• All unit tests pass
• Experiment validation successful
• Follows existing codebase patterns and conventions

Fixes #37

🤖 Generated with Claude Code

Co-Authored-By: Claude noreply@anthropic.com

[konard]

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