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.

config.py

@@ -29,5 +29,8 @@ class Settings(BaseSettings):
     whitelist_cost: int = Field(100, alias="WHITELIST_COST")
     whitelist_device_threshold: int = Field(6, alias="WHITELIST_DEVICE_THRESHOLD")
 
+    general_squad: str = Field("2de0b5ea-49b9-4181-916f-ae67b9c83b80")
+    whitelist_squad: str = Field("e4435baa-64d3-4b29-a18e-81ad1c60d977")
+
 
 settings = Settings()  # type: ignore