Add middleware and refactor admin handlers for improved functionality

- Introduced `DependenciesMiddleware` and `BlacklistMiddleware` for enhanced request handling across all routers.
- Refactored admin handlers to utilize new middleware, improving access control and error handling.
- Updated the `admin_router` to include middleware for access checks and streamlined the process of banning users.
- Enhanced the structure of admin handler imports for better organization and maintainability.
- Improved error handling in various admin functions to ensure robust user interactions.

tests/test_refactored_private_handlers.py

@@ -46,13 +46,22 @@ class TestPrivateHandlers:
     def mock_message(self):
         """Mock Telegram message"""
         message = Mock(spec=types.Message)
-        message.from_user.id = 12345
-        message.from_user.full_name = "Test User"
-        message.from_user.username = "testuser"
-        message.from_user.is_bot = False
-        message.from_user.language_code = "ru"
+        # Создаем мок для from_user
+        from_user = Mock()
+        from_user.id = 12345
+        from_user.full_name = "Test User"
+        from_user.username = "testuser"
+        from_user.is_bot = False
+        from_user.language_code = "ru"
+        message.from_user = from_user
+        
         message.text = "test message"
-        message.chat.id = 12345
+        
+        # Создаем мок для chat
+        chat = Mock()
+        chat.id = 12345
+        message.chat = chat
+        
         message.bot = Mock()
         message.bot.send_message = AsyncMock()
         message.forward = AsyncMock()