Add rules management feature with GitHub Gist monitoring

[konard]

🎯 Summary

This PR implements the rules management feature requested in issue #61. The bot can now monitor GitHub Gists containing chat rules and automatically update pinned messages when rules change.

📋 Features Implemented

Core Functionality

• Set Rules: set rules <gist_url> - Configure rules from GitHub Gist
• Remove Rules: remove rules - Disable rules monitoring
• Status Check: rules status - View current configuration
• Multi-language Support: Commands work in English and Russian
• Background Monitoring: Checks for rule changes every 5 minutes
• Auto-Update: Automatically updates pinned messages when rules change

VK API Integration

• Added message pinning/unpinning capabilities
• Message editing for seamless rule updates
• Enhanced error handling for API operations

Data Persistence

• JSON-based configuration storage
• Tracks gist URLs, update history, and message IDs
• Resilient to bot restarts

🔧 Implementation Details

New Components

• RulesService - Core rules management logic
• New command patterns for English/Russian
• Background monitoring thread
• VK API methods for message management

Modified Components

• Extended Commands class with rules handlers
• Updated help message with new commands
• Enhanced Bot class with monitoring capabilities

🧪 Testing

• ✅ Pattern matching tests pass
• ✅ GitHub API integration verified
• ✅ Syntax validation completed
• ✅ Real gist fetching tested

Test results:

Testing SET_RULES_GIST:
✓ All pattern variations matched correctly
Testing REMOVE_RULES_GIST:
✓ All pattern variations matched correctly  
Testing GET_RULES_STATUS:
✓ All pattern variations matched correctly
Testing GitHub API access:
✓ Successfully fetched gist content (1688 characters)

📖 Usage Examples

Setting rules:

set rules https://gist.github.com/Konard/a7cd43f91c035e412037cbb3de75d540

Checking status:

rules status

Removing rules:

remove rules

🎁 Benefits

1. Centralized Management - Rules stored in version-controlled GitHub Gists
2. Real-time Updates - No manual intervention needed for rule changes
3. Multi-language Support - Works for Russian and English communities
4. Persistent Configuration - Survives bot restarts
5. Error Resilience - Comprehensive error handling

📚 Documentation

Complete feature documentation available in python/RULES_FEATURE.md

🔗 Closes

Fixes #61

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