add server code

tools/server/server-task.cpp

@@ -1495,6 +1495,17 @@ json server_task_result_rerank::to_json() {
     };
 }
 
+//
+// server_task_result_decision
+//
+json server_task_result_decision::to_json() {
+    return json {
+        {"index",            index},
+        {"scores",           scores},
+        {"tokens_evaluated", n_tokens},
+    };
+}
+
 //
 // server_task_result_error
 //