优化execute_local_ai_agent返回值

apps/jingrow/frontend/src/locales/zh-CN.json

@@ -148,6 +148,7 @@
   "Create failed": "创建失败",
   "Updated successfully": "更新成功",
   "Saved successfully": "保存成功",
+  "Submitted successfully": "提交成功",
   "Running": "进行中",
   "Inactive": "停用",
   "Pending": "待执行",

apps/jingrow/frontend/src/views/pagetype/ai_agent/ai_agent_list_actions.vue

@@ -77,7 +77,7 @@ async function handleExecute() {
     const result = res?.message || res
     
     if (result?.success) {
-      message.success(result.message || props.context.t('Agent execution started successfully'))
+      message.success(props.context.t('Submitted successfully'))
     } else {
       message.error(result?.error || props.context.t('Execution failed'))
     }

apps/jingrow/frontend/src/views/pagetype/ai_agent/ai_agent_toolbar.vue

@@ -204,7 +204,7 @@ async function handleExecute() {
     const result = res?.message || res
     
     if (result?.success) {
-      message.success(result.message || t('Agent execution started successfully'))
+      message.success(t('Submitted successfully'))
     } else {
       message.error(result?.error || t('Execution failed'))
     }

apps/jingrow/frontend/src/views/pagetype/local_ai_agent/local_ai_agent_list_actions.vue

@@ -77,7 +77,7 @@ async function handleExecute() {
     const result = res?.message || res
     
     if (result?.success) {
-      message.success(result.message || props.context.t('Agent execution started successfully'))
+      message.success(props.context.t('Submitted successfully'))
     } else {
       message.error(result?.error || props.context.t('Execution failed'))
     }

apps/jingrow/frontend/src/views/pagetype/local_ai_agent/local_ai_agent_toolbar.vue

@@ -204,7 +204,7 @@ async function handleExecute() {
     const result = res?.message || res
     
     if (result?.success) {
-      message.success(result.message || t('Agent execution started successfully'))
+      message.success(t('Submitted successfully'))
     } else {
       message.error(result?.error || t('Execution failed'))
     }

apps/jingrow/jingrow/ai/utils/jlocal.py

@@ -368,7 +368,6 @@ def execute_local_ai_agent(name: str) -> Dict[str, Any]:
 		
 		return {
 			'success': True,
-			'message': 'Agent execution started successfully',
 			'job_id': job_id,
 			'agent_id': agent_id,
 			'agent_name': agent_name