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

apps/web/src/pages/login/LoginPage.tsx

@@ -0,0 +1,35 @@
+import type { ReactNode } from 'react';
+
+import { LoginBrandPanel } from './LoginBrandPanel';
+import { LoginFormCard } from './LoginFormCard';
+import { useLoginForm } from './use-login-form';
+
+export default function LoginPage(): ReactNode {
+  const { account, password, submitting, setAccount, setPassword, handleSubmit } = useLoginForm();
+
+  return (
+    <main className="lx-login">
+      <LoginBrandPanel />
+      <section className="lx-login__panel">
+        <LoginFormCard
+          account={account}
+          password={password}
+          submitting={submitting}
+          onAccountChange={setAccount}
+          onPasswordChange={setPassword}
+          onSubmit={(event) => {
+            void handleSubmit(event);
+          }}
+        />
+      </section>
+      <footer className="lx-login__footer">
+        <span>© 2026 灵犀 · 内部系统</span>
+        <span className="lx-login__footer-links">
+          <span>隐私政策</span>
+          <span>服务条款</span>
+          <span>华东一区</span>
+        </span>
+      </footer>
+    </main>
+  );
+}