fix: 收敛 Agent 设计器导航与记忆配置

- 增加返回智能体列表入口

- 移除旧消息数压缩参数并保持令牌阈值配置

easyflow-ui-admin/app/src/views/ai/agents/AgentDesigner.vue

@@ -9,7 +9,8 @@ import type {
 import { computed, onActivated, onDeactivated, onMounted, ref } from 'vue';
 import { useRoute, useRouter } from 'vue-router';
 
-import { ElMessage, ElMessageBox } from 'element-plus';
+import { ArrowLeft } from '@element-plus/icons-vue';
+import { ElButton, ElMessage, ElMessageBox } from 'element-plus';
 import { tryit } from 'radash';
 
 import { api } from '#/api/request';
@@ -502,10 +503,22 @@ function handleTryout() {
 function handleCloseTryout() {
   selectBase();
 }
+
+function handleBack() {
+  router.push(AGENT_TAB_PAGE_KEY);
+}
 </script>
 
 <template>
   <div v-loading="pageLoading" class="agent-designer">
+    <ElButton
+      class="agent-designer__back"
+      :icon="ArrowLeft"
+      aria-label="返回智能体列表"
+      @click="handleBack"
+    >
+      返回智能体列表
+    </ElButton>
     <template v-if="contentReady">
       <AgentStudioCanvas
         :active="canvasActive"
@@ -566,4 +579,13 @@ function handleCloseTryout() {
     ),
     var(--el-fill-color-extra-light);
 }
+
+.agent-designer__back {
+  position: absolute;
+  top: var(--space-6);
+  left: var(--space-6);
+  z-index: 10;
+  border-radius: var(--radius-control);
+  box-shadow: var(--shadow-subtle);
+}
 </style>