Clean up IRC command architecture and eliminate redundancy

Major cleanup of the modular command system:

**Legacy Code Removal:**
- Removed all legacy command handlers from src/bot.py (74 lines)
- Eliminated outdated command implementations superseded by modular system
- Maintained backward compatibility while cleaning up codebase

**Duplicate Command Consolidation:**
- Removed duplicate status/uptime/ping commands from admin.py
- Kept comprehensive implementations in connection_monitor.py
- Eliminated 3 redundant commands and ~70 lines of duplicate code

**Admin System Standardization:**
- Updated backup_commands.py to use central ADMIN_USER from config.py
- Updated connection_monitor.py to use central ADMIN_USER from config.py
- Removed hardcoded admin user lists across modules
- Ensured consistent admin privilege checking system-wide

**Benefits:**
- Cleaner, more maintainable command structure
- No duplicate functionality across modules
- Consistent admin configuration management
- Reduced codebase size while maintaining all functionality
- Better separation of concerns in modular architecture

This cleanup addresses technical debt identified in the command audit
and prepares the codebase for future development.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

modules/backup_commands.py

@@ -3,6 +3,12 @@ from src.backup_manager import BackupManager, BackupScheduler
 import asyncio
 import logging
 from datetime import datetime
+import sys
+import os
+
+# Add parent directory to path for config import
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+from config import ADMIN_USER
 
 
 class BackupCommands(BaseModule):
@@ -53,10 +59,7 @@ class BackupCommands(BaseModule):
     
     async def _is_admin(self, nickname):
         """Check if user has admin privileges."""
-        # This should be implemented based on your admin system
-        # For now, using a simple check - replace with actual admin verification
-        admin_users = ["admin", "megaproxy"]  # Add your admin usernames
-        return nickname.lower() in admin_users
+        return nickname.lower() == ADMIN_USER.lower()
     
     async def cmd_backup(self, channel, nickname, args):
         """Create a manual backup."""