feat: introduced plans pricing

repositories/pricing.py

@@ -0,0 +1,15 @@
+from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from db.models.pricing import PricingConfig
+
+
+class PricingRepository:
+    def __init__(self, session: AsyncSession) -> None:
+        self.session = session
+
+    async def get(self) -> PricingConfig | None:
+        stmt = select(PricingConfig).where(PricingConfig.id == 1)
+        r = await self.session.execute(stmt)
+
+        return r.scalar_one_or_none()