feat(component): 添加后退按钮组件并应用到多个页面

- 新增 BackButton 组件，用于实现后退功能
- 在 agent、knowledge、intelligent-agent 等模块的多个页面中集成后退按钮
- 优化后退按钮的样式和交互效果

src/views/knowledge/detail/index.vue

@@ -1,6 +1,14 @@
 <template>
   <div class=" render-container">
     <div class="clearfix flex align-items-c justify-content-b ">
+      <div class="hover-back  mr5">
+        <el-icon
+          class="el-icon-arrow-left"
+          style="font-size: 24px;cursor: pointer"
+          @click.native="$router.history.go(-1)"
+        ></el-icon>
+      </div>
+
       <img
         :src="knowledgeImage ? knowledgeImage : knowledgePng_1"
         class="header-icon"
@@ -990,4 +998,12 @@ export default {
     font-style: normal;
   }
 }
+
+.hover-back {
+  padding: 10px 5px;
+  &:hover {
+    background: rgba(87, 104, 161, 0.2);
+    border-radius: 5px;
+  }
+}
 </style>