feat: implement billing system with Pally integration

- Added billing models and repository for handling bills.
- Introduced BillingService to manage payment initiation and bill creation.
- Updated user service to remove ticket-related functionality.
- Refactored settings to include new billing-related fields.
- Removed ticket-related handlers and schemas.
- Added new billing handlers for processing payments.
- Updated database schema with new bills table and status enum.
- Enhanced utility functions to calculate prices considering discounts.
- Introduced prehandling for non-private messages.
- Updated main application to initialize new billing services and repositories.

services/user_service.py

@@ -4,18 +4,15 @@ from aiogram.types import Message
 from remnawave import RemnawaveSDK
 from sqlalchemy.ext.asyncio import AsyncSession
 
-from db.models.tickets import TicketStatus
 from db.models.users import User
 from misc import utils
 from repositories import UserRepository
-from repositories.tickets import TicketRepository
-from schemas.users import NewUserDTO, TicketCreator
+from schemas.users import NewUserDTO
 from services.rw import RWUserInfo, get_user_by_telegram_id
 from texts import (
     NO_SUBSCRIPTION,
     NOTHING_PLACEHOLDER,
     SUBSCRIPTION_INFORMATION,
-    TICKET_STATUS_EMOJIS,
 )
 
 logger = logging.getLogger(__name__)
@@ -25,24 +22,8 @@ class UserServiceError(Exception): ...
 
 
 class UserService:
-    def __init__(
-        self, user_repository: UserRepository, ticket_repository: TicketRepository
-    ) -> None:
+    def __init__(self, user_repository: UserRepository) -> None:
         self.user_repository = user_repository
-        self.ticket_repository = ticket_repository
-
-    @staticmethod
-    def format_ticket_name(
-        creator: TicketCreator,
-        status: TicketStatus | None = TicketStatus.OPEN,
-        ticket_id: int | None = None,
-    ):
-        return (
-            TICKET_STATUS_EMOJIS[status.value]
-            + (f" T-{ticket_id:0>3}" if ticket_id else "")
-            + " | "
-            + (f"@{creator.username}" if creator.username else str(creator.id))
-        )
 
     @staticmethod
     def format_subscription_message(
@@ -90,7 +71,7 @@ class UserService:
 
     async def update_user_link(
         self, session: AsyncSession, user_id: int, rw_sdk: RemnawaveSDK
-    ) -> User:
+    ) -> User | None:
         rw_user = await get_user_by_telegram_id(rw_sdk, user_id)
 
         user = await self.user_repository.get_user_by_id(session, user_id)