调整api结构；恢复丢失部分api，详见scripts文件夹；新增关阀分析算法，实现api

app/services/valve_isolation.py

@@ -0,0 +1,7 @@
+from typing import Any
+
+from app.algorithms.valve_isolation import valve_isolation_analysis
+
+
+def analyze_valve_isolation(network: str, accident_element: str) -> dict[str, Any]:
+    return valve_isolation_analysis(network, accident_element)