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/shared/package.json

@@ -0,0 +1,34 @@
+{
+  "name": "@lingxi/shared",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "main": "./dist/index.cjs",
+  "module": "./dist/index.js",
+  "types": "./dist/index.d.ts",
+  "exports": {
+    ".": {
+      "types": "./dist/index.d.ts",
+      "import": "./dist/index.js",
+      "require": "./dist/index.cjs"
+    }
+  },
+  "files": [
+    "dist"
+  ],
+  "scripts": {
+    "build": "tsup src/index.ts --format esm,cjs --dts --clean --sourcemap",
+    "dev": "tsup src/index.ts --format esm,cjs --dts --watch",
+    "typecheck": "tsc -p tsconfig.json --noEmit",
+    "test": "vitest run --coverage"
+  },
+  "dependencies": {
+    "zod": "3.25.76"
+  },
+  "devDependencies": {
+    "@vitest/coverage-v8": "3.2.7",
+    "tsup": "8.5.1",
+    "typescript": "5.9.3",
+    "vitest": "3.2.7"
+  }
+}