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.

services/user_service.py

@@ -14,6 +14,7 @@ from repositories.subscriptions import SubscriptionRepository
 from schemas.subscriptions import InternalSquads, SubscriptionPlan, SubscriptionStatus
 from schemas.users import NewUserDTO
 from services import rw
+from config import settings
 
 logger = logging.getLogger(__name__)
 
@@ -220,3 +221,22 @@ class UserService:
 
         remaining_days = max(0, (rw_user.expire_at - datetime.datetime.now(datetime.UTC)).days)
         return math.floor(db_sub.plan_price_paid * remaining_days / db_sub.duration_days)
+
+    async def launch_promotion(
+        self,
+        session: AsyncSession,
+        promo_msg: Message
+    ) -> int:
+        users = await self.user_repository.get_users(session)
+
+        sent = 0
+        for user in users:
+            if user.id in settings.admins:
+                continue
+            try:
+                await promo_msg.copy_to(user.id)
+                sent += 1
+            except Exception:
+                logger.exception("caught an exception while launching promo, skipping user...")
+        
+        return sent