update:更新自定义写作风格模块

backend/app/models/writing_style.py

@@ -0,0 +1,23 @@
+"""写作风格数据模型"""
+from sqlalchemy import Column, String, Text, Boolean, DateTime, ForeignKey, Integer
+from sqlalchemy.sql import func
+from app.database import Base
+
+
+class WritingStyle(Base):
+    """写作风格表"""
+    __tablename__ = "writing_styles"
+    
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    project_id = Column(String(36), ForeignKey("projects.id", ondelete="CASCADE"), nullable=True, comment="所属项目ID（NULL表示全局预设风格）")
+    name = Column(String(100), nullable=False, comment="风格名称")
+    style_type = Column(String(50), nullable=False, comment="风格类型：preset/custom")
+    preset_id = Column(String(50), comment="预设风格ID：natural/classical/modern等")
+    description = Column(Text, comment="风格描述")
+    prompt_content = Column(Text, nullable=False, comment="风格提示词内容")
+    order_index = Column(Integer, default=0, comment="排序序号")
+    created_at = Column(DateTime, server_default=func.now(), comment="创建时间")
+    updated_at = Column(DateTime, server_default=func.now(), onupdate=func.now(), comment="更新时间")
+    
+    def __repr__(self):
+        return f"<WritingStyle(id={self.id}, name={self.name}, project_id={self.project_id})>"