Refactor voice handler and update welcome message

- Reintroduced the cancel handler registration in the voice handler for private chats, ensuring users can cancel interactions with the bot.
- Updated the welcome message in the messages utility to reflect the new voice bot access method and added instructions for using the /restart command.
- Improved clarity in the welcome message by including a link to the bot's help command and contact information for user support.

helper_bot/handlers/voice/voice_handler.py

@@ -36,6 +36,12 @@ class VoiceHandlers:
         self.router.message.middleware(BlacklistMiddleware())
 
     def _setup_handlers(self):
+        self.router.message.register(
+            self.cancel_handler,
+            ChatTypeFilter(chat_type=["private"]),
+            F.text == "Отменить"
+        )
+        
         # Обработчик кнопки "Голосовой бот"
         self.router.message.register(
             self.voice_bot_button_handler,
@@ -97,12 +103,6 @@ class VoiceHandlers:
         )
         
         # Новые обработчики кнопок
-        self.router.message.register(
-            self.cancel_handler,
-            ChatTypeFilter(chat_type=["private"]),
-            F.text == "Отменить"
-        )
-        
         self.router.message.register(
             self.refresh_listen_function,
             ChatTypeFilter(chat_type=["private"]),