fix：修复LPMM学习问题

src/chat/knowledge/embedding_store.py

@@ -2,6 +2,7 @@ from dataclasses import dataclass
 import json
 import os
 import math
+import asyncio
 from typing import Dict, List, Tuple
 
 import numpy as np
@@ -99,7 +100,30 @@ class EmbeddingStore:
         self.idx2hash = None
 
     def _get_embedding(self, s: str) -> List[float]:
-        return get_embedding(s)
+        """获取字符串的嵌入向量，处理异步调用"""
+        try:
+            # 尝试获取当前事件循环
+            asyncio.get_running_loop()
+            # 如果在事件循环中，使用线程池执行
+            import concurrent.futures
+            
+            def run_in_thread():
+                return asyncio.run(get_embedding(s))
+            
+            with concurrent.futures.ThreadPoolExecutor() as executor:
+                future = executor.submit(run_in_thread)
+                result = future.result()
+                if result is None:
+                    logger.error(f"获取嵌入失败: {s}")
+                    return []
+                return result
+        except RuntimeError:
+            # 没有运行的事件循环，直接运行
+            result = asyncio.run(get_embedding(s))
+            if result is None:
+                logger.error(f"获取嵌入失败: {s}")
+                return []
+            return result
 
     def get_test_file_path(self):
         return EMBEDDING_TEST_FILE