添加GraphRAG后端

backend/run_import.py

@@ -0,0 +1,37 @@
+#!/usr/bin/env python3
+"""
+独立命令行导入脚本。
+
+用法:
+  python run_import.py          # 增量导入（MERGE，不删除现有数据）
+  python run_import.py --clear  # 清空图谱后全量重新导入
+"""
+
+import sys
+from dotenv import load_dotenv
+from graph_query import get_driver
+from graph_builder import build_graph
+
+load_dotenv()
+
+
+def main():
+    clear = "--clear" in sys.argv
+
+    print("Connecting to Neo4j...")
+    driver = get_driver()
+    driver.verify_connectivity()
+    print("Connected.\n")
+
+    build_graph(driver, clear=clear)
+
+    print("\nGraph stats:")
+    from graph_query import get_graph_stats
+    for k, v in get_graph_stats().items():
+        print(f"  {k}: {v}")
+
+    driver.close()
+
+
+if __name__ == "__main__":
+    main()