feature: 新增伏笔管理系统，支持可视化追踪、AI智能关联回收及章节生成时的伏笔提醒

backend/app/main.py

@@ -130,7 +130,7 @@ from app.api import (
     wizard_stream, relationships, organizations,
     auth, users, settings, writing_styles, memories,
     mcp_plugins, admin, inspiration, prompt_templates,
-    changelog, careers
+    changelog, careers, foreshadows
 )
 
 app.include_router(auth.router, prefix="/api")
@@ -149,6 +149,7 @@ app.include_router(relationships.router, prefix="/api")
 app.include_router(organizations.router, prefix="/api")
 app.include_router(writing_styles.router, prefix="/api")
 app.include_router(memories.router)  # 记忆管理API (已包含/api前缀)
+app.include_router(foreshadows.router)  # 伏笔管理API (已包含/api前缀)
 app.include_router(mcp_plugins.router, prefix="/api")  # MCP插件管理API
 app.include_router(prompt_templates.router, prefix="/api")  # 提示词模板管理API
 app.include_router(changelog.router, prefix="/api")  # 更新日志API