feat: 将应用图标从SVG格式更换为JPG格式

- 在app-instance前端应用中将logo图标从/boardware-logo.svg替换为/boardware-logo.jpg
- 在auth-portal认证门户中将logo图标从/boardware-logo.svg替换为/boardware-logo.jpg
- 更新了layout.tsx、Header.tsx以及登录注册页面中的图标引用
- 删除了原有的SVG格式logo文件

auth-portal/src/app/layout.tsx

@@ -5,7 +5,7 @@ export const metadata: Metadata = {
   title: 'Boardware Agent Sandbox Auth Portal',
   description: 'Dedicated login and registration portal for nanobot containers.',
   icons: {
-    icon: '/boardware-logo.svg',
+    icon: '/boardware-logo.jpg',
   },
 };
 

auth-portal/src/app/login/page.tsx

@@ -37,7 +37,7 @@ export default function LoginPage() {
         <div className="portal-brand">
           <div className="portal-logo-lockup">
             <Image
-              src="/boardware-logo.svg"
+              src="/boardware-logo.jpg"
               alt="Boardware logo"
               width={128}
               height={128}

auth-portal/src/app/register/page.tsx

@@ -42,7 +42,7 @@ export default function RegisterPage() {
         <div className="portal-brand">
           <div className="portal-logo-lockup">
             <Image
-              src="/boardware-logo.svg"
+              src="/boardware-logo.jpg"
               alt="Boardware logo"
               width={128}
               height={128}