fix(Layout): 全局布局优化与 Mock 数据增强

src/layouts/MainLayout.js

@@ -9,7 +9,7 @@ import BackToTopButton from "./components/BackToTopButton";
 import ErrorBoundary from "../components/ErrorBoundary";
 import PageLoader from "../components/Loading/PageLoader";
 import GlobalSidebar from "../components/GlobalSidebar";
-import { BACK_TO_TOP_CONFIG } from "./config/layoutConfig";
+import { BACK_TO_TOP_CONFIG, LAYOUT_SIZE } from "./config/layoutConfig";
 
 // ✅ P0 性能优化：缓存静态组件，避免路由切换时不必要的重新渲染
 // HomeNavbar (1623行) 和 AppFooter 不依赖路由参数，使用 memo 可大幅减少渲染次数
@@ -40,7 +40,7 @@ export default function MainLayout() {
             <Box flex="1" bg="#1A202C" position="relative" overflow="hidden">
                 {/* 页面内容区域 - 全宽度，与导航栏对齐 */}
                 <Box h="100%" overflowY="auto" display="flex" flexDirection="column">
-                    <Box flex="1">
+                    <Box flex="1" pt={LAYOUT_SIZE.navbarHeight}>
                         <ErrorBoundary>
                             <Suspense fallback={<PageLoader message="页面加载中..." />}>
                                 <Outlet />