Add 'My Devices' feature to user subscription management

- Implemented a new command handler for displaying user devices.
- Added functionality to disconnect devices from the user's account.
- Updated subscription service to retrieve and manage device information.
- Enhanced inline keyboard to include device management options.
- Added new translations for device-related messages in English and Russian locales.

bot/keyboards/inline/user_keyboards.py

@@ -159,11 +159,16 @@ def get_referral_link_keyboard(lang: str,
 
 
 def get_back_to_main_menu_markup(lang: str,
-                                 i18n_instance) -> InlineKeyboardMarkup:
+                                 i18n_instance,
+                                 callback_data: Optional[str] = None) -> InlineKeyboardMarkup:
     _ = lambda key, **kwargs: i18n_instance.gettext(lang, key, **kwargs)
     builder = InlineKeyboardBuilder()
-    builder.button(text=_(key="back_to_main_menu_button"),
-                   callback_data="main_action:back_to_main")
+    if callback_data:
+        builder.button(text=_(key="back_to_main_menu_button"),
+                       callback_data=callback_data)
+    else:
+        builder.button(text=_(key="back_to_main_menu_button"),
+                       callback_data="main_action:back_to_main")
     return builder.as_markup()