feat(frontend): 实现仪表盘和子系统导航

页面：
- views/dashboard/Index.vue，首页仪表盘（资源大盘、集群拓扑、最近任务）
- views/subsystem/Navigation.vue，子系统导航页（6 个卡片网格展示）

组件：
- components/SubsystemCard.vue，子系统卡片组件（图标、名称、状态、SSO 跳转）

API：
- api/subsystem.ts，子系统相关接口（获取列表、SSO URL）

子系统：Wayne、CloudDM、CacheCloud、Apollo、qpass、Grafana

frontend/src/api/subsystem.ts

@@ -0,0 +1,101 @@
+import request from './request'
+
+export interface Subsystem {
+  id: number
+  name: string
+  description: string
+  icon: string
+  url: string
+  status: 'integrated' | 'integrating'
+  sso_enabled: boolean
+}
+
+// Mock 数据
+const mockSubsystems: Subsystem[] = [
+  {
+    id: 1,
+    name: 'Wayne',
+    description: '多集群容器管理平台',
+    icon: 'W',
+    url: 'https://wayne.qiniu.com',
+    status: 'integrated',
+    sso_enabled: true,
+  },
+  {
+    id: 2,
+    name: 'CloudDM',
+    description: '数据库管理与SQL审核',
+    icon: 'DM',
+    url: 'https://clouddm.qiniu.com',
+    status: 'integrated',
+    sso_enabled: true,
+  },
+  {
+    id: 3,
+    name: 'CacheCloud',
+    description: 'Redis 云管理平台',
+    icon: 'CC',
+    url: 'https://cachecloud.qiniu.com',
+    status: 'integrated',
+    sso_enabled: true,
+  },
+  {
+    id: 4,
+    name: 'Apollo',
+    description: '配置中心',
+    icon: 'AP',
+    url: 'https://apollo.xinfra.internal',
+    status: 'integrated',
+    sso_enabled: true,
+  },
+  {
+    id: 5,
+    name: 'qpass',
+    description: '密码管理平台',
+    icon: 'QP',
+    url: 'https://qpass.xinfra.internal',
+    status: 'integrated',
+    sso_enabled: true,
+  },
+  {
+    id: 6,
+    name: 'Grafana',
+    description: '监控可视化平台',
+    icon: 'GF',
+    url: 'https://grafana.xinfra.internal',
+    status: 'integrated',
+    sso_enabled: true,
+  },
+]
+
+export const subsystemApi = {
+  // 获取子系统列表
+  getSubsystems(): Promise<any> {
+    return new Promise((resolve) => {
+      setTimeout(() => {
+        resolve({
+          code: 0,
+          message: 'success',
+          data: mockSubsystems,
+        })
+      }, 300)
+    })
+  },
+
+  // 获取 SSO 跳转 URL
+  getSSOUrl(id: number): Promise<any> {
+    return new Promise((resolve) => {
+      setTimeout(() => {
+        const subsystem = mockSubsystems.find((s) => s.id === id)
+        resolve({
+          code: 0,
+          message: 'success',
+          data: {
+            sso_url: subsystem?.url + '/sso/callback?code=mock-code&state=mock-state',
+            expires_in: 300,
+          },
+        })
+      }, 200)
+    })
+  },
+}