Refactor bot handlers and keyboards; implement admin features

- Removed unused prehandling, referrals, support, and states files.
- Updated admin and client handlers to improve structure and functionality.
- Introduced admin filters and routers for better access control.
- Added new billing and deposit functionalities for client interactions.
- Enhanced keyboard layouts for admin and client menus.
- Implemented promotion handling for admin users.
- Updated configuration to include admin settings.
- Improved utility functions for quote fetching and menu text building.
- Added common handlers for undefined commands and message deletions.

bot/handlers/admins/ads.py

@@ -0,0 +1,52 @@
+from aiogram import F, Router
+from aiogram.fsm.context import FSMContext
+from aiogram.types import CallbackQuery, Message
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from schemas.di import DependenciesDTO
+from schemas.promotions import NewPromotionContext
+from bot.texts import ADM_PROMO_INIT, CALLBACK_FALLBACK, GENERAL_PROCESSING, ADM_VERIFY_PROMOTION, SUCCESSFULLY_SENT_PROMO
+from bot.keyboards.common import return_to_menu
+from bot.keyboards.admins import action_confirmation
+from bot.states.admins import AdminStorage
+
+router = Router()
+
+@router.callback_query(F.data == "promotion")
+async def promo_init(cb: CallbackQuery, state: FSMContext):
+    await state.clear()
+
+    await cb.message.edit_text(ADM_PROMO_INIT, reply_markup=return_to_menu)
+
+    ctx = NewPromotionContext(cb.message)
+    await state.set_state(AdminStorage.promotion_msg)
+    await state.set_data({"ctx": ctx})
+
+@router.message(AdminStorage.promotion_msg)
+async def promo_text(msg: Message, state: FSMContext):
+    data = await state.get_data()
+    await state.clear()
+
+    edited_msg = await msg.answer(GENERAL_PROCESSING)
+    ctx: NewPromotionContext | None = data.get("ctx")
+    if ctx:
+        await ctx.msg.delete()
+    
+    ctx.promotion = msg
+    await edited_msg.edit_text(ADM_VERIFY_PROMOTION, reply_markup=action_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 promo_send(cb: CallbackQuery, state: FSMContext, session: AsyncSession, deps: DependenciesDTO):
+    data = await state.get_data()
+    await state.clear()
+
+    ctx: NewPromotionContext | None = data.get("ctx")
+    if not (ctx and ctx.promotion and ctx.msg):
+        await cb.message.edit_text(CALLBACK_FALLBACK, reply_markup=return_to_menu)
+        return
+    
+    successful = await deps.user_service.launch_promotion(session, ctx.promotion)
+    await cb.message.edit_text(SUCCESSFULLY_SENT_PROMO.format(successful=successful), reply_markup=return_to_menu)