feat: 新增管理端工作台总览

- 新增 Dashboard 统计接口、菜单迁移与权限点

- 管理端工作台页面切换为真实概览数据和趋势图

- 默认首页切换到工作台

easyflow-ui-admin/app/src/api/dashboard.ts

@@ -0,0 +1,49 @@
+import { requestClient } from '#/api/request';
+
+export type DashboardRange = '7d' | '30d' | 'today';
+
+export interface DashboardOverviewQuery {
+  range?: DashboardRange;
+}
+
+export interface DashboardSummary {
+  activeUserTotal: number;
+  botTotal: number;
+  knowledgeBaseTotal: number;
+  userTotal: number;
+  workflowTotal: number;
+}
+
+export interface DashboardTrendItem {
+  activeUserTotal: number;
+  key: string;
+  label: string;
+}
+
+export interface DashboardDistributionItem {
+  activeUserTotal: number;
+  botTotal: number;
+  key: string;
+  knowledgeBaseTotal: number;
+  label: string;
+  userTotal: number;
+  value: number;
+  workflowTotal: number;
+}
+
+export interface DashboardOverviewResponse {
+  distribution: DashboardDistributionItem[];
+  query: DashboardOverviewQuery;
+  summary: DashboardSummary;
+  trends: DashboardTrendItem[];
+  updatedAt: string;
+}
+
+export async function getDashboardOverview(params: DashboardOverviewQuery) {
+  return requestClient.get<DashboardOverviewResponse>(
+    '/api/v1/dashboard/overview',
+    {
+      params,
+    },
+  );
+}