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/layouts/MainLayout.tsx

@@ -0,0 +1,87 @@
+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>
+  );
+}