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.

helper_bot/handlers/private/constants.py

@@ -1,7 +1,9 @@
 """Constants for private handlers"""
 
+from typing import Final
+
 # FSM States
-FSM_STATES = {
+FSM_STATES: Final[dict[str, str]] = {
     "START": "START",
     "SUGGEST": "SUGGEST",
     "PRE_CHAT": "PRE_CHAT",
@@ -9,7 +11,7 @@ FSM_STATES = {
 }
 
 # Button texts
-BUTTON_TEXTS = {
+BUTTON_TEXTS: Final[dict[str, str]] = {
     "SUGGEST_POST": "📢Предложить свой пост",
     "SAY_GOODBYE": "👋🏼Сказать пока!",
     "LEAVE_CHAT": "Выйти из чата",
@@ -19,7 +21,7 @@ BUTTON_TEXTS = {
 }
 
 # Error messages
-ERROR_MESSAGES = {
+ERROR_MESSAGES: Final[dict[str, str]] = {
     "UNSUPPORTED_CONTENT": (
         'Я пока не умею работать с таким сообщением. '
         'Пришли текст и фото/фоты(ы). А лучше перешли это сообщение админу @kerrad1\n'