chore: initialize tuhui repository

backend/app/models/user.py

@@ -0,0 +1,15 @@
+from sqlalchemy import Column, Integer, String, DateTime, Float
+from sqlalchemy.sql import func
+from app.core.database import Base
+
+class User(Base):
+    __tablename__ = "users"
+    
+    id = Column(Integer, primary_key=True, index=True)
+    phone = Column(String(20), unique=True, index=True, nullable=False)  # 手机号作为唯一标识
+    password_hash = Column(String(255), nullable=False)
+    nickname = Column(String(100), nullable=True)
+    avatar = Column(String(500), nullable=True)
+    balance = Column(Float, default=0.0)  # 账户余额
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())