feat(api): add database models

api/app/models/category.py

@@ -0,0 +1,33 @@
+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")