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.

main.py

@@ -10,9 +10,11 @@ from config import settings
 from db.session import async_session
 from handlers import routers
 from middlewares import DIMiddleware
-from repositories.tickets import TicketRepository
+from misc.pally import PallyClient
+from repositories.bills import BillsRepository
 from repositories.users import UserRepository
 from schemas.di import DependenciesDTO
+from services.billing_service import BillingService
 from services.user_service import UserService
 
 logging.basicConfig(level=logging.DEBUG)
@@ -21,9 +23,15 @@ logging.basicConfig(level=logging.DEBUG)
 async def main():
     dp = Dispatcher()
 
+    pally_client = PallyClient(settings.pally_token)
+
     user_repository = UserRepository()
-    ticket_repository = TicketRepository()
-    user_service = UserService(user_repository, ticket_repository)
+    user_service = UserService(user_repository)
+
+    bills_repository = BillsRepository()
+    billing_service = BillingService(
+        user_repository=user_repository, bills_repository=bills_repository
+    )
 
     rw_sdk = RemnawaveSDK(
         base_url=settings.remnawave_url,
@@ -31,10 +39,12 @@ async def main():
     )
 
     deps = DependenciesDTO(
-        ticket_repository=ticket_repository,
         user_repository=user_repository,
         user_service=user_service,
         rw_sdk=rw_sdk,
+        pally_client=pally_client,
+        bills_repository=bills_repository,
+        billing_service=billing_service,
     )
     dp.update.middleware.register(DIMiddleware(deps, async_session))