feat(api): add database models

api/app/models/__init__.py

@@ -0,0 +1,5 @@
+from app.models.joke import Joke
+from app.models.category import JokeType, JokeCrowd
+from app.models.user import AdminUser
+
+__all__ = ["Joke", "JokeType", "JokeCrowd", "AdminUser"]

api/app/models/category.py

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+from sqlalchemy import Column, Integer, String, DateTime
+from sqlalchemy.orm import relationship
+from sqlalchemy.sql import func
+
+from app.database import Base
+
+
+class JokeType(Base):
+    """笑话类型表模型"""
+    __tablename__ = "joke_types"
+
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    name = Column(String(50), nullable=False)
+    icon = Column(String(50), nullable=True)
+    sort_order = Column(Integer, default=0)
+    created_at = Column(DateTime, default=func.now())
+
+    # Relationships
+    jokes = relationship("Joke", back_populates="type")
+
+
+class JokeCrowd(Base):
+    """笑话人群表模型"""
+    __tablename__ = "joke_crowds"
+
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    name = Column(String(50), nullable=False)
+    icon = Column(String(50), nullable=True)
+    sort_order = Column(Integer, default=0)
+    created_at = Column(DateTime, default=func.now())
+
+    # Relationships
+    jokes = relationship("Joke", back_populates="crowd")

api/app/models/joke.py

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+from sqlalchemy import Column, Integer, String, Text, DateTime, ForeignKey
+from sqlalchemy.orm import relationship
+from sqlalchemy.sql import func
+
+from app.database import Base
+
+
+class Joke(Base):
+    """笑话表模型"""
+    __tablename__ = "jokes"
+
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    title = Column(String(200), nullable=False)
+    content = Column(Text, nullable=False)
+    type_id = Column(Integer, ForeignKey("joke_types.id"), nullable=True)
+    crowd_id = Column(Integer, ForeignKey("joke_crowds.id"), nullable=True)
+    status = Column(String(20), default="pending")
+    view_count = Column(Integer, default=0)
+    like_count = Column(Integer, default=0)
+    created_at = Column(DateTime, default=func.now())
+    updated_at = Column(DateTime, default=func.now(), onupdate=func.now())
+
+    # Relationships
+    type = relationship("JokeType", back_populates="jokes")
+    crowd = relationship("JokeCrowd", back_populates="jokes")

api/app/models/user.py

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+from sqlalchemy import Column, Integer, String, DateTime
+from sqlalchemy.sql import func
+
+from app.database import Base
+
+
+class AdminUser(Base):
+    """管理员用户表模型"""
+    __tablename__ = "admin_users"
+
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    username = Column(String(50), unique=True, nullable=False)
+    password_hash = Column(String(255), nullable=False)
+    created_at = Column(DateTime, default=func.now())