新增: playwright e2e 测试基建与 tauri 垫片

invoke 条件垫片使前端可在无 tauri 容器下直连 dev server 做端到端验证

playwright.config.ts

@@ -0,0 +1,21 @@
+import { defineConfig } from 'playwright/test'
+
+export default defineConfig({
+  testDir: 'tests/e2e',
+  timeout: 60_000,
+  headless: true,
+  // 单文件单用例,冒烟规模无需并行;减少并发也降低 vite 冷启动抖动导致的偶发失败
+  workers: 1,
+  retries: 0,
+  reporter: [['list']],
+  use: {
+    baseURL: 'http://localhost:1420',
+    headless: true,
+  },
+  webServer: {
+    command: 'npm run dev',
+    url: 'http://localhost:1420',
+    reuseExistingServer: true,
+    timeout: 120_000,
+  },
+})