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.

handlers/ads.py

@@ -1,69 +1,5 @@
-from aiogram import F, Router
-from aiogram.filters import Command
-from aiogram.fsm.context import FSMContext
-from aiogram.types import CallbackQuery, Message
-from sqlalchemy.ext.asyncio import AsyncSession
-
-from config import settings
-from keyboards.admins import promotion_confirmation
-from keyboards.client import close_kb
-from schemas.di import DependenciesDTO
-from schemas.promotions import NewPromotionContext
-from states.admins import AdminStorage
-from texts import (
-    ADMIN_PROMOTION_CONFIRMATION,
-    ADMIN_PROMOTION_INIT,
-    ADMIN_STANDARD_FALLBACK,
-    SUCCESSFULLY_SENT_PROMOTION,
-)
+from aiogram import Router
 
 router = Router()
 
-
-@router.message(
-    F.chat.id == settings.admin_group_id, F.message_thread_id.is_(None), Command("push")
-)
-async def push_cmd(msg: Message, state: FSMContext):
-    await state.clear()
-
-    ctx = NewPromotionContext(creator_id=msg.from_user.id)
-    await msg.delete()
-    await msg.answer(ADMIN_PROMOTION_INIT, reply_markup=close_kb)
-
-    await state.set_state(AdminStorage.promotion_msg)
-    await state.set_data({"ctx": ctx})
-
-
-@router.message(F.chat.id == settings.admin_group_id, AdminStorage.promotion_msg)
-async def send_promotion(msg: Message, state: FSMContext):
-    data = await state.get_data()
-
-    ctx: NewPromotionContext | None = data.get("ctx")
-    if not ctx:
-        await msg.answer(ADMIN_STANDARD_FALLBACK)
-        return
-
-    ctx.message = msg
-    await msg.reply(ADMIN_PROMOTION_CONFIRMATION, reply_markup=promotion_confirmation)
-
-    await state.set_state(AdminStorage.promotion_msg)
-    await state.set_data({"ctx": ctx})
-
-
-@router.callback_query(AdminStorage.promotion_msg, F.data.in_(["approve", "decline"]))
-async def promotion_action(
-    cb: CallbackQuery, state: FSMContext, session: AsyncSession, deps: DependenciesDTO
-):
-    data = await state.get_data()
-    await state.clear()
-
-    await cb.message.delete()
-    if cb.data == "decline":
-        return
-    ctx: NewPromotionContext | None = data.get("ctx")
-    if not (ctx and ctx.creator_id and ctx.message):
-        await cb.message.answer(ADMIN_STANDARD_FALLBACK)
-        return
-
-    sent = await deps.user_service.send_promotion_to_users(session, ctx.message)
-    await cb.message.answer(SUCCESSFULLY_SENT_PROMOTION.format(user_count=len(sent)))
+# FIXME: Refine newsletter system