first commit

src/chongming/app/service/user.py

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+from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession
+from typing import Optional
+
+from ..model.user import User
+from ..core.security import get_password_hash
+
+
+class UserService:
+    @staticmethod
+    async def get_user_by_email(email: str, session: AsyncSession) -> Optional[User]:
+        result = await session.execute(select(User).where(User.email == email))  # type: ignore
+        return result.scalar_one_or_none()
+
+    @staticmethod
+    async def get_user_by_id(user_id: int, session: AsyncSession) -> Optional[User]:
+        return await session.get(User, user_id)
+
+    @staticmethod
+    async def create_user(
+        session: AsyncSession, email: str, password: str, **kwargs
+    ) -> User:
+        hashed = get_password_hash(password)
+        user = User(email=email, hashed_password=hashed, **kwargs)
+        session.add(user)
+        await session.commit()
+        await session.refresh(user)
+        return user