feat: 统一管理端弹窗与内容区交互样式

- 收敛管理端公共 Modal 链路，新增表单弹窗与普通内容弹窗包装\n- 迁移 Bot、知识库、插件、工作流、资源、MCP、数据中枢与系统管理页面级弹窗\n- 统一内容区工具栏、列表容器、导航与顶部按钮的视觉密度和交互节奏

easyflow-ui-admin/app/src/views/datacenter/DatacenterTableList.vue

@@ -17,6 +17,7 @@ import {
 
 import { api } from '#/api/request';
 import HeaderSearch from '#/components/headerSearch/HeaderSearch.vue';
+import ListPageShell from '#/components/page/ListPageShell.vue';
 import PageData from '#/components/page/PageData.vue';
 import { $t } from '#/locales';
 import { router } from '#/router';
@@ -95,13 +96,14 @@ function toDetailPage(row: any) {
 <template>
   <div class="flex h-full flex-col gap-6 p-6">
     <DatacenterTableModal ref="saveDialog" @reload="reset" />
-    <HeaderSearch
-      :buttons="headerButtons"
-      @search="handleSearch"
-      @button-click="showDialog({})"
-    />
-
-    <div class="bg-background border-border flex-1 rounded-lg border p-5">
+    <ListPageShell>
+      <template #filters>
+        <HeaderSearch
+          :buttons="headerButtons"
+          @search="handleSearch"
+          @button-click="showDialog({})"
+        />
+      </template>
       <PageData
         ref="pageDataRef"
         page-url="/api/v1/datacenterTable/page"
@@ -168,7 +170,7 @@ function toDetailPage(row: any) {
           </ElTable>
         </template>
       </PageData>
-    </div>
+    </ListPageShell>
   </div>
 </template>