修改rag，实现混合检索

tools/test/simple_delete.py

@@ -0,0 +1,30 @@
+#!/usr/bin/env python3
+"""
+简单删除 Qdrant 集合
+"""
+
+import sys
+import os
+
+project_root = os.path.join(os.path.dirname(__file__), "..", "..")
+sys.path.insert(0, os.path.join(project_root, "backend"))
+
+from rag_core.client import create_qdrant_client
+
+
+def delete_collection():
+    print("="*70)
+    print("删除 rag_documents 集合...")
+    print("="*70)
+    
+    client = create_qdrant_client()
+    
+    try:
+        client.delete_collection("rag_documents")
+        print("✅ 删除成功")
+    except Exception as e:
+        print(f"⚠️ 删除失败: {e}")
+
+
+if __name__ == "__main__":
+    delete_collection()