update:1.更新大纲细化功能

backend/app/models/chapter.py

@@ -17,8 +17,16 @@ class Chapter(Base):
     summary = Column(Text, comment="章节摘要")
     word_count = Column(Integer, default=0, comment="字数统计")
     status = Column(String(20), default="draft", comment="章节状态")
+    
+    # 大纲关联字段（实现一对多关系）
+    outline_id = Column(String(36), ForeignKey("outlines.id", ondelete="SET NULL"), nullable=True, comment="关联的大纲ID")
+    sub_index = Column(Integer, default=1, comment="大纲下的子章节序号")
+    
+    # 大纲展开规划数据（JSON格式）
+    expansion_plan = Column(Text, comment="展开规划详情(JSON): 包含key_events, character_focus, emotional_tone等")
+    
     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"<Chapter(id={self.id}, chapter_number={self.chapter_number}, title={self.title})>"
+        return f"<Chapter(id={self.id}, chapter_number={self.chapter_number}, title={self.title}, outline_id={self.outline_id})>"