feat(admin): art-design-pro integration with local session auth

P1b Task 9: apps/admin based on art-design-pro v3.0.2 (tag, commit
d224dd4; source recorded in apps/admin/SOURCE.md), trimmed to
layout/login/i18n/request/table-form core. Login wired to real
POST /v1/auth/password (single-token session), Bearer header on all
requests, 401 interceptor logout+redirect, request-driven sliding
renewal (refresh at ~80% TTL, single-flight), best-effort
POST /v1/auth/logout on user-menu logout. One protected stub page
(相册管理). Dev port 5176 strictPort + /v1 proxy to 8080. Admin keeps
its own eslint9 flat config; root eslint ignores apps/admin/**.
vitest unit tests for renewal pacing + Playwright e2e (guard redirect,
localized wrong-password error, login lands on stub, token persists
across reload, logout clears session).

Co-Authored-By: Claude Code <noreply@anthropic.com>

apps/admin/vitest.config.ts

@@ -0,0 +1,31 @@
+import path from 'node:path'
+import { fileURLToPath } from 'node:url'
+import vue from '@vitejs/plugin-vue'
+import { defineConfig } from 'vitest/config'
+
+// 仅收集单元测试（纯函数）；e2e/ 归 Playwright（test:e2e）。
+// 别名与 vite.config.ts 对齐（被测模块的导入链会拉到 router/views 的 .vue）。
+const r = (p: string) => path.resolve(fileURLToPath(new URL('.', import.meta.url)), p)
+
+export default defineConfig({
+  plugins: [vue()],
+  define: {
+    // vite.config.ts 里由 VITE_VERSION 注入；单测环境直接给常量
+    __APP_VERSION__: JSON.stringify('0.1.0')
+  },
+  resolve: {
+    alias: {
+      '@': r('src'),
+      '@views': r('src/views'),
+      '@imgs': r('src/assets/images'),
+      '@icons': r('src/assets/icons'),
+      '@utils': r('src/utils'),
+      '@stores': r('src/store'),
+      '@styles': r('src/assets/styles')
+    }
+  },
+  test: {
+    environment: 'jsdom',
+    include: ['src/**/*.{test,spec}.ts']
+  }
+})