perf: 优化页面加载速度与资源分配，提升用户体验#4
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Significantly improves page load speed and user interaction responsiveness. - Implements dynamic import (`next/dynamic`) for large/non-critical components to enable code splitting and reduce initial JS payload. - Refactors data fetching in homepage for prioritized, staged loading of above-the-fold content followed by background fetch for secondary data. - Optimizes Next.js config: enables SWC minification, advanced image optimizations and package import trimming. - Adds font and third-party resource prefetch, preconnect in root layout. - Introduces new utilities for resource preloading, performance monitoring, optimized images, and advanced lazy loading patterns. - Fixes lint error caused by empty function in new performance.ts utility. These changes decrease first paint and largest contentful paint metrics, leading to a visibly faster and smoother site. No breaking changes.
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Summary
本 PR 系统性优化了页面加载体验，通过优先级资源分配、动态导入和多项 Next.js 配置提升，显著缩短首屏加载及总体响应时间，并完善性能监控体系。
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