修复3000白屏的Logo加载

- 将侧边栏 logo_square.png 从 Vite 模块 import 改为 /logo_square.png 静态路径，避免浏览器把图片按 JS module 加载。

- 验证 3000 页面可挂载登录页 DOM，Sidebar 测试、类型检查、生产构建和 diff 检查通过。

src/components/Sidebar.tsx

@@ -5,7 +5,6 @@ import type { ActiveModule } from '../App';
 import { ModelStatusBadge } from './ModelStatusBadge';
 import { useStore } from '../store/useStore';
 import { AiSegmentationIcon } from './AiSegmentationIcon';
-import logoSquareUrl from '../../logo_square.png';
 
 interface SidebarProps {
   activeModule: ActiveModule;
@@ -27,7 +26,7 @@ export function Sidebar({ activeModule, setActiveModule }: SidebarProps) {
   return (
     <aside className="w-16 flex flex-col items-center py-6 bg-[#0d0d0d] border-r border-white/10 z-50 gap-8">
       <div className="w-10 h-10 rounded-lg overflow-hidden flex items-center justify-center bg-white">
-        <img src={logoSquareUrl} alt="Logo" className="w-full h-full object-cover" />
+        <img src="/logo_square.png" alt="Logo" className="w-full h-full object-cover" />
       </div>
       <nav className="flex flex-col gap-6 w-full px-2">
         {navItems.map((item) => {