引入二级大纲功能，新增父子节点关系及子节点排序，同时调整API与UI以支持嵌套大纲管理

.claude/settings.local.json

@@ -21,7 +21,9 @@
       "Bash(curl -s -X POST http://127.0.0.1:8000/api/novels -H \"Content-Type: application/json\" --data-raw \"{\"\"title\"\":\"\"Novel A\"\",\"\"description\"\":\"\"Desc A\"\"}\")",
       "Bash(curl -s -X POST http://127.0.0.1:8000/api/novels -H \"Content-Type: application/json\" --data-raw \"{\"\"title\"\":\"\"Novel B\"\",\"\"description\"\":\"\"Desc B\"\"}\")",
       "Bash(taskkill //F //IM uvicorn.exe)",
-      "Bash(taskkill //F //IM python.exe)"
+      "Bash(taskkill //F //IM python.exe)",
+      "Bash(git add:*)",
+      "Bash(git commit:*)"
     ]
   }
 }