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.

services/rw.py

@@ -4,7 +4,7 @@ from datetime import UTC, datetime, timedelta
 from uuid import UUID
 
 from remnawave import RemnawaveSDK
-from remnawave.models import UpdateUserRequestDto
+from remnawave.models import CreateUserRequestDto, UpdateUserRequestDto
 
 logger = logging.getLogger(__name__)
 
@@ -319,3 +319,33 @@ async def update_squads(
             exc,
         )
         return False
+
+
+async def create_user(
+    sdk: RemnawaveSDK,
+    username: str,
+    telegram_id: int,
+    expire_at: datetime,
+    hwid_device_limit: int | None,
+    squad_uuids: list[str],
+) -> RWUserInfo | None:
+    """
+    Создать нового пользователя в Remnawave.
+    hwid_device_limit=None → без ограничений.
+    Возвращает RWUserInfo при успехе, None при ошибке.
+    """
+    try:
+        dto = CreateUserRequestDto(
+            username=username,
+            telegram_id=telegram_id,
+            expire_at=expire_at,
+            hwid_device_limit=hwid_device_limit,
+            active_internal_squads=[UUID(s) for s in squad_uuids] if squad_uuids else None,
+        )
+        result = await sdk.users.create_user(dto)
+        if result is None:
+            return None
+        return _parse_user(result)
+    except Exception as exc:
+        logger.warning("Failed to create user username=%s: %s", username, exc)
+        return None