feat: ChatOptions add "send" property

agents-flex-core/src/main/java/com/agentsflex/core/llm/ChatOptions.java

@@ -36,12 +36,21 @@ public class ChatOptions {
     };
 
 
+    private String seed;
     private Float temperature = 0.8f;
     private Float topP;
     private Integer topK;
     private Integer maxTokens;
     private List<String> stop;
 
+    public String getSeed() {
+        return seed;
+    }
+
+    public void setSeed(String seed) {
+        this.seed = seed;
+    }
+
     public Float getTemperature() {
         return temperature;
     }