feat(a0): 完成工程骨架与契约基线

- 建立 pnpm workspace + Turborepo 单仓、ESLint 9/Prettier/commitlint/husky 门禁
- NestJS + Fastify API：统一错误体、trace_id、Zod 管道、/health 真实依赖探活、OpenAPI 3.1 契约
- Prisma 基线：outbox_events/idempotency_keys/system_configs 与首版迁移、幂等种子
- shared 契约包：错误码、权限点、ULID、游标分页、命名/时间工具
- ui 包与 Web 壳层：Semi + Remix 图标统一出口、Cloud Blue 视觉、登录/工作台/错误页
- worker 骨架、Playwright 冒烟、Gitea CI、OpenAPI 快照与 oasdiff 回退脚本
- 补充 A0 实施报告与本地开发说明

e2e/smoke.spec.ts

@@ -0,0 +1,38 @@
+import { expect, type Page, test } from '@playwright/test';
+
+async function signIn(page: Page): Promise<void> {
+  await page.goto('/login');
+  await page.getByPlaceholder('请输入账号或邮箱').fill('admin');
+  await page.getByPlaceholder('请输入密码').fill('demo1234');
+  await page.getByTestId('login-submit').click();
+  await expect(page.getByTestId('app-shell')).toBeVisible();
+}
+
+test('登录页打开并进入工作台', async ({ page }) => {
+  await page.goto('/login');
+  await expect(page.getByRole('heading', { name: '登录灵犀' })).toBeVisible();
+  await signIn(page);
+  await expect(page).toHaveURL('/');
+  await expect(page.getByRole('heading', { name: '工作台', exact: true })).toBeVisible();
+  await expect(page.getByRole('navigation', { name: '模块导航' })).toBeVisible();
+});
+
+test('403 页可演示', async ({ page }) => {
+  await page.goto('/403');
+  await expect(page.getByTestId('error-403')).toBeVisible();
+  await expect(page.getByRole('heading', { name: '没有访问权限' })).toBeVisible();
+});
+
+test('模块切换与侧边栏、面包屑联动', async ({ page }) => {
+  await signIn(page);
+  await page.getByRole('button', { name: '素材', exact: true }).click();
+  await expect(page).toHaveURL(/\/material/);
+  await page.getByRole('link', { name: '快筛', exact: true }).click();
+  await expect(page.getByRole('heading', { name: '快筛' })).toBeVisible();
+  await expect(page.getByRole('navigation', { name: '面包屑' })).toContainText('素材');
+});
+
+test('未知路由展示 404', async ({ page }) => {
+  await page.goto('/404');
+  await expect(page.getByTestId('error-404')).toBeVisible();
+});