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/__init__.py

@@ -1,21 +1,9 @@
-from .ads import router as ads_router
-from .billing import router as billing_router
-from .buy import router as buy_router
-from .common import router as common_router
-from .deposit import router as deposit_router
-from .menus import router as menus_router
-from .prehandling import router as prehandling_router
-from .referals import router as referal_router
-from .support import router as support_router
+from .admins import routers as admin_routers
+from .client import routers as client_routers
+from .system import routers as system_routers
 
-routers = [
-    prehandling_router,
-    referal_router,
-    billing_router,
-    deposit_router,
-    menus_router,
-    ads_router,
-    support_router,
-    buy_router,
-    common_router,
+__all__ = [
+    "admin_routers",
+    "client_routers",
+    "system_routers",
 ]