brand: 替换品牌名称为嘉驰英才，使用新Logo

- 登录页/注册页/忘记密码/员工端登录：品牌名改为嘉驰英才
- 登录页公司全称：嘉驰英才（上海）信息科技有限公司
- Logo组件改为使用 JClog.png 图片
- 全局替换所有"安职通"为"嘉驰英才"

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Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

frontend/src/components/layout/PortalLayout.tsx

@@ -35,8 +35,8 @@ export default function PortalLayout({ children }: { children: React.ReactNode }
       <header className="sticky top-0 z-30 bg-white border-b border-gray-200 pt-safe">
         <div className="max-w-md mx-auto h-14 flex items-center justify-between px-4">
           <div className="flex items-center gap-2 min-w-0">
-            <Logo className="w-6 h-6 text-primary flex-shrink-0" />
-            <span className="text-sm font-bold text-gray-900 truncate">安职通</span>
+            <Logo className="w-6 h-6 object-contain flex-shrink-0" />
+            <span className="text-sm font-bold text-gray-900 truncate">嘉驰英才</span>
           </div>
           <div className="flex items-center gap-2 flex-shrink-0">
             {employee.name && (