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

packages/ui/scripts/copy-assets.mjs

@@ -0,0 +1,13 @@
+import { cp, mkdir } from 'node:fs/promises';
+import { dirname, resolve } from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+const root = resolve(dirname(fileURLToPath(import.meta.url)), '..');
+
+await mkdir(resolve(root, 'dist/theme'), { recursive: true });
+await cp(resolve(root, 'src/theme/tokens.css'), resolve(root, 'dist/theme/tokens.css'));
+await cp(resolve(root, 'src/styles/components.css'), resolve(root, 'dist/styles.css'));
+await cp(
+  resolve(root, 'node_modules/@douyinfe/semi-ui-19/dist/css/semi.min.css'),
+  resolve(root, 'dist/semi.css'),
+);