refactor: clean up unused code and duplicate handlers
- Removed duplicate admin callback handlers from main.py (moved to admin_panel.py) - Removed unused methods from BotController (handle_admin_panel, handle_lottery_management, handle_conduct_lottery_admin, handle_conduct_lottery) - Removed unused keyboard methods from ui.py (get_lottery_management_keyboard, get_lottery_keyboard, get_conduct_lottery_keyboard) - Simplified IBotController interface to only essential methods - Simplified IKeyboardBuilder interface to only used methods - Fixed cmd_admin handler to directly show admin panel - Bot now uses centralized admin handlers from admin_panel.py
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