feat: 新增服务看板页面

实现 Dashboard 看板视图并将应用默认入口由调优改为看板，路由、侧边栏默认菜单与登录跳转同步调整；侧边栏增加导航失败高亮校正，布局与 ECharts 注册柱状图适配看板，补充两份回归脚本、设计走查记录与五张设计截图。

frontend/package.json

@@ -8,6 +8,8 @@
     "build": "vue-tsc -b && vite build",
     "preview": "vite preview",
     "type-check": "vue-tsc -b --noEmit",
+    "test:default-dashboard": "node scripts/regression-default-dashboard.mjs",
+    "test:dashboard": "node scripts/regression-dashboard.mjs",
     "test:data-process-list": "node scripts/regression-data-process-list.mjs",
     "test:data-process-wizard": "node scripts/regression-data-process-wizard.mjs",
     "test:dataset-task-tab": "node scripts/regression-dataset-task-tab.mjs",