feat: complete Phase 1 infrastructure

- erp-core: error types, shared types, event bus, ErpModule trait
- erp-server: config loading, database/Redis connections, migrations
- erp-server/migration: tenants table with SeaORM
- apps/web: Vite + React 18 + TypeScript + Ant Design 5 + TailwindCSS
- Web frontend: main layout with sidebar, header, routing
- Docker: PostgreSQL 16 + Redis 7 development environment
- All workspace crates compile successfully (cargo check passes)

apps/web/src/App.tsx

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+import { HashRouter, Routes, Route } from 'react-router-dom';
+import { ConfigProvider, theme as antdTheme } from 'antd';
+import zhCN from 'antd/locale/zh_CN';
+import MainLayout from './layouts/MainLayout';
+import { useAppStore } from './stores/app';
+
+function HomePage() {
+  return <div>欢迎来到 ERP 平台</div>;
+}
+
+export default function App() {
+  const { theme: appTheme } = useAppStore();
+
+  return (
+    <ConfigProvider
+      locale={zhCN}
+      theme={{
+        algorithm: appTheme === 'dark' ? antdTheme.darkAlgorithm : antdTheme.defaultAlgorithm,
+      }}
+    >
+      <HashRouter>
+        <MainLayout>
+          <Routes>
+            <Route path="/" element={<HomePage />} />
+          </Routes>
+        </MainLayout>
+      </HashRouter>
+    </ConfigProvider>
+  );
+}

apps/web/src/index.css

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+@import "tailwindcss";
+
+body {
+  margin: 0;
+}

apps/web/src/layouts/MainLayout.tsx

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+import { Layout, Menu, theme, Button, Avatar, Badge, Space } from 'antd';
+import {
+  HomeOutlined,
+  UserOutlined,
+  SafetyOutlined,
+  BellOutlined,
+  SettingOutlined,
+  MenuFoldOutlined,
+  MenuUnfoldOutlined,
+} from '@ant-design/icons';
+import { useAppStore } from '../stores/app';
+
+const { Header, Sider, Content, Footer } = Layout;
+
+const menuItems = [
+  { key: '/', icon: <HomeOutlined />, label: '首页' },
+  { key: '/users', icon: <UserOutlined />, label: '用户管理' },
+  { key: '/roles', icon: <SafetyOutlined />, label: '权限管理' },
+  { key: '/settings', icon: <SettingOutlined />, label: '系统设置' },
+];
+
+export default function MainLayout({ children }: { children: React.ReactNode }) {
+  const { sidebarCollapsed, toggleSidebar, tenantName } = useAppStore();
+  const { token } = theme.useToken();
+
+  return (
+    <Layout style={{ minHeight: '100vh' }}>
+      <Sider trigger={null} collapsible collapsed={sidebarCollapsed} width={220}>
+        <div
+          style={{
+            height: 48,
+            display: 'flex',
+            alignItems: 'center',
+            justifyContent: 'center',
+            color: '#fff',
+            fontSize: sidebarCollapsed ? 16 : 18,
+            fontWeight: 'bold',
+          }}
+        >
+          {sidebarCollapsed ? 'E' : 'ERP Platform'}
+        </div>
+        <Menu theme="dark" mode="inline" items={menuItems} defaultSelectedKeys={['/']} />
+      </Sider>
+      <Layout>
+        <Header
+          style={{
+            padding: '0 16px',
+            background: token.colorBgContainer,
+            display: 'flex',
+            alignItems: 'center',
+            justifyContent: 'space-between',
+            borderBottom: `1px solid ${token.colorBorderSecondary}`,
+          }}
+        >
+          <Space>
+            <Button
+              type="text"
+              icon={sidebarCollapsed ? <MenuUnfoldOutlined /> : <MenuFoldOutlined />}
+              onClick={toggleSidebar}
+            />
+          </Space>
+          <Space size="middle">
+            <Badge count={5}>
+              <BellOutlined style={{ fontSize: 18 }} />
+            </Badge>
+            <Avatar icon={<UserOutlined />} />
+            <span>Admin</span>
+          </Space>
+        </Header>
+        <Content
+          style={{
+            margin: 16,
+            padding: 24,
+            background: token.colorBgContainer,
+            borderRadius: token.borderRadiusLG,
+            minHeight: 280,
+          }}
+        >
+          {children}
+        </Content>
+        <Footer style={{ textAlign: 'center', padding: '8px 16px' }}>
+          {tenantName || 'ERP Platform'} · v0.1.0
+        </Footer>
+      </Layout>
+    </Layout>
+  );
+}

apps/web/src/main.tsx

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+import { StrictMode } from 'react'
+import { createRoot } from 'react-dom/client'
+import './index.css'
+import App from './App.tsx'
+
+createRoot(document.getElementById('root')!).render(
+  <StrictMode>
+    <App />
+  </StrictMode>,
+)

apps/web/src/stores/app.ts

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+import { create } from 'zustand';
+
+interface AppState {
+  isLoggedIn: boolean;
+  tenantName: string;
+  theme: 'light' | 'dark';
+  sidebarCollapsed: boolean;
+  toggleSidebar: () => void;
+  setTheme: (theme: 'light' | 'dark') => void;
+  login: () => void;
+  logout: () => void;
+}
+
+export const useAppStore = create<AppState>((set) => ({
+  isLoggedIn: false,
+  tenantName: '',
+  theme: 'light',
+  sidebarCollapsed: false,
+  toggleSidebar: () => set((s) => ({ sidebarCollapsed: !s.sidebarCollapsed })),
+  setTheme: (theme) => set({ theme }),
+  login: () => set({ isLoggedIn: true }),
+  logout: () => set({ isLoggedIn: false }),
+}));