feat: add subscription and transaction repositories

- Implemented SubscriptionRepository with methods to get, create, and update subscriptions.
- Added BalanceTXRepository for creating and retrieving balance transactions.
- Introduced a test script for simulating Pally webhook for local testing.

bot/states/deposit.py

@@ -0,0 +1,5 @@
+from aiogram.fsm.state import State, StatesGroup
+
+
+class DepositStorage(StatesGroup):
+    amount = State()