chore: initialize tuhui repository

backend/app/models/__init__.py

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+"""数据库模型"""

backend/app/models/download.py

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+from sqlalchemy import Column, Integer, DateTime, ForeignKey
+from sqlalchemy.sql import func
+from app.core.database import Base
+
+class DownloadRecord(Base):
+    __tablename__ = "download_records"
+    
+    id = Column(Integer, primary_key=True, index=True)
+    user_id = Column(Integer, ForeignKey("users.id"), nullable=False, index=True)
+    work_id = Column(Integer, ForeignKey("works.id"), nullable=False, index=True)
+    order_id = Column(Integer, ForeignKey("orders.id"), nullable=False, index=True)
+    
+    downloaded_at = Column(DateTime(timezone=True), server_default=func.now())

backend/app/models/order.py

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+from sqlalchemy import Column, Integer, String, Float, DateTime, ForeignKey, Enum
+from sqlalchemy.sql import func
+from app.core.database import Base
+import enum
+
+class OrderStatus(str, enum.Enum):
+    PENDING = "pending"  # 待支付
+    PAID = "paid"  # 已支付
+    CANCELLED = "cancelled"  # 已取消
+    REFUNDED = "refunded"  # 已退款
+
+class Order(Base):
+    __tablename__ = "orders"
+    
+    id = Column(Integer, primary_key=True, index=True)
+    order_no = Column(String(100), unique=True, index=True, nullable=False)  # 订单号
+    
+    user_id = Column(Integer, ForeignKey("users.id"), nullable=False, index=True)
+    work_id = Column(Integer, ForeignKey("works.id"), nullable=False, index=True)
+    
+    amount = Column(Float, nullable=False)  # 金额
+    payment_method = Column(String(50))  # 支付方式：alipay, wechat, balance
+    
+    status = Column(Enum(OrderStatus), default=OrderStatus.PENDING, index=True)
+    
+    paid_at = Column(DateTime(timezone=True), nullable=True)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())

backend/app/models/user.py

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+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())

backend/app/models/work.py

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+from sqlalchemy import Column, Integer, String, Float, DateTime, Text
+from sqlalchemy.sql import func
+from app.core.database import Base
+
+class Work(Base):
+    __tablename__ = "works"
+    
+    id = Column(Integer, primary_key=True, index=True)
+    title = Column(String(255), nullable=False, index=True)
+    category = Column(String(100), index=True)
+    designer = Column(String(100))
+    level = Column(Integer, default=1)
+    level_text = Column(String(50))
+    
+    # 文件路径
+    original_image = Column(String(500))  # 原图（高清）
+    watermarked_image = Column(String(500))  # 带水印图（详情页显示）
+    thumbnail_image = Column(String(500))  # 缩略图（列表显示）
+    
+    # 价格
+    price = Column(Float, default=0.0)  # 下载价格（元）
+    
+    # 统计
+    views = Column(Integer, default=0)  # 浏览量
+    downloads = Column(Integer, default=0)  # 下载量
+    collects = Column(Integer, default=0)  # 收藏量
+    
+    # 描述
+    description = Column(Text, nullable=True)
+    tags = Column(String(500), nullable=True)  # JSON 格式存储标签
+    
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())