feat: 全站 PageShell 设计系统与专业 UI 统一

- 新增 PageShell/PageTabs/ContentPanel/PageLoading/PageEmpty 页面骨架
- index.css 设计令牌文档化，布局令牌与纯色主按钮（去除渐变粉彩）
- 全站路由页接入 PageShell，云账单三 Tab 为标杆
- 主题体系：跟随系统 + 主流/开发者分组，新增 Dracula/Tokyo Night，One Dark 暖灰差异化
- 登录页/侧栏/顶栏去渐变光球，企业克制风
- 修复 AIAlertAnalyzer JSX 与构建依赖导入问题

frontend/src/components/deploy/pipeline-helpers.tsx

@@ -47,21 +47,21 @@ export function getStatusBadge( status: string) {
   switch (status) {
     case 'success':
       return (
-        <Badge variant="outline" className="border-emerald-500/30 text-emerald-400 bg-emerald-500/10">
+        <Badge variant="outline" className="border-emerald-500/30 dg-text-green bg-emerald-500/10">
           <CheckCircle className="h-3 w-3 mr-1" />
           成功
         </Badge>
       );
     case 'failed':
       return (
-        <Badge variant="outline" className="border-red-500/30 text-red-400 bg-red-500/10">
+        <Badge variant="outline" className="border-red-500/30 dg-text-red bg-red-500/10">
           <XCircle className="h-3 w-3 mr-1" />
           失败
         </Badge>
       );
     case 'running':
       return (
-        <Badge variant="outline" className="border-blue-500/30 text-blue-400 bg-blue-500/10 animate-pulse">
+        <Badge variant="outline" className="border-blue-500/30 dg-text-blue bg-blue-500/10 animate-pulse">
           <Loader2 className="h-3 w-3 mr-1 animate-spin" />
           运行中
         </Badge>
@@ -79,11 +79,11 @@ export function getStatusBadge( status: string) {
 export function getStageStatusIcon(status: PipelineStage['status']) {
   switch (status) {
     case 'success':
-      return <CheckCircle className="h-4 w-4 text-emerald-400" />;
+      return <CheckCircle className="h-4 w-4 dg-text-green" />;
     case 'failed':
-      return <XCircle className="h-4 w-4 text-red-400" />;
+      return <XCircle className="h-4 w-4 dg-text-red" />;
     case 'running':
-      return <Loader2 className="h-4 w-4 text-blue-400 animate-spin" />;
+      return <Loader2 className="h-4 w-4 dg-text-blue animate-spin" />;
     case 'skipped':
       return <span className="text-[var(--dg-text-secondary)] text-xs">跳过</span>;
     default: