test: E2E auth fixture 修复 + Workflow 集成测试

- E2E: 用 addInitScript 替代 goto+evaluate 注入 localStorage，
  解决 Zustand store 初始化时序问题 (10/10 通过)
- E2E: 修复 Modal 按钮选择器 (OK/Cancel 替代中文)
- E2E: Playwright 配置对齐端口 5174
- 集成测试: 新增 workflow_tests 模块 (4 个测试)

apps/web/playwright.config.ts

@@ -8,7 +8,7 @@ export default defineConfig({
   forbidOnly: !!process.env.CI,
   reporter: 'html',
   use: {
-    baseURL: 'http://localhost:5173',
+    baseURL: 'http://localhost:5174',
     headless: true,
     screenshot: 'only-on-failure',
     trace: 'on-first-retry',
@@ -21,7 +21,8 @@ export default defineConfig({
   ],
   webServer: {
     command: 'pnpm dev',
-    port: 5173,
+    port: 5174,
     reuseExistingServer: true,
+    timeout: 30000,
   },
 });