(feature)(chat)agent记忆管理启用的few-shot优先，避免shffle过程的随机性导致被全局的few-shot替代

headless/chat/src/main/java/com/tencent/supersonic/headless/chat/parser/llm/PromptHelper.java

@@ -51,7 +51,9 @@ public class PromptHelper {
         // use random collection of exemplars for each self-consistency inference
         for (int i = 0; i < selfConsistencyNumber; i++) {
             List<Text2SQLExemplar> shuffledList = new ArrayList<>(exemplars);
-            Collections.shuffle(shuffledList);
+            // only shuffle the exemplars from config
+            List<Text2SQLExemplar> subList=shuffledList.subList(llmReq.getDynamicExemplars().size(),shuffledList.size());
+            Collections.shuffle(subList);
             results.add(shuffledList.subList(0, Math.min(shuffledList.size(), fewShotNumber)));
         }