feat: Implement payment notification system and API structure

- Added notifications for successful payments in `api/core/notifications.py`.
- Created main API entry point in `api/main.py` with FastAPI integration.
- Established routing structure in `api/routes/__init__.py` and `api/routes/pally.py` for handling payment callbacks.
- Developed billing handlers in `bot/handlers/billing.py` and `bot/handlers/buy.py` for subscription management.
- Introduced state management for user interactions in `bot/states/`.
- Created user interface elements in `bot/keyboards/` for navigation and payment processing.
- Set up middleware for dependency injection in `bot/middlewares/di.py`.
- Added support for user commands and interactions in `bot/handlers/common.py` and `bot/handlers/support.py`.
- Implemented logging and error handling throughout the bot's functionality.
- Created entry point script for API server in `entrypoints/api.sh`.

services/user_service.py

@@ -4,16 +4,16 @@ from aiogram.types import Message
 from remnawave import RemnawaveSDK
 from sqlalchemy.ext.asyncio import AsyncSession
 
+from bot.texts import (
+    NO_SUBSCRIPTION,
+    NOTHING_PLACEHOLDER,
+    SUBSCRIPTION_INFORMATION,
+)
 from db.models.users import User
 from misc import utils
 from repositories import UserRepository
 from schemas.users import NewUserDTO
 from services.rw import RWUserInfo, get_user_by_telegram_id
-from texts import (
-    NO_SUBSCRIPTION,
-    NOTHING_PLACEHOLDER,
-    SUBSCRIPTION_INFORMATION,
-)
 
 logger = logging.getLogger(__name__)