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

playwright.config.ts

@@ -0,0 +1,36 @@
+import { defineConfig, devices } from '@playwright/test';
+
+const channel = process.env.CI ? undefined : 'chrome';
+
+export default defineConfig({
+  testDir: './e2e',
+  timeout: 60_000,
+  expect: { timeout: 10_000 },
+  fullyParallel: true,
+  forbidOnly: Boolean(process.env.CI),
+  retries: process.env.CI ? 2 : 0,
+  reporter: process.env.CI
+    ? [['list'], ['html', { open: 'never' }], ['junit', { outputFile: 'test-results/e2e.xml' }]]
+    : [['list'], ['html', { open: 'never' }]],
+  use: {
+    baseURL: 'http://127.0.0.1:4173',
+    trace: 'on-first-retry',
+    screenshot: 'only-on-failure',
+    channel,
+  },
+  projects: [
+    {
+      name: 'chromium',
+      use: { ...devices['Desktop Chrome'], channel },
+    },
+  ],
+  webServer: {
+    command: 'node node_modules/vite/bin/vite.js preview --host 127.0.0.1 --port 4173 --strictPort',
+    cwd: 'apps/web',
+    url: 'http://127.0.0.1:4173/login',
+    reuseExistingServer: false,
+    timeout: 60_000,
+    stdout: 'ignore',
+    stderr: 'pipe',
+  },
+});