新增 logo、優化 AI 問答

app/register/page.tsx

@@ -176,8 +176,12 @@ export default function RegisterPage() {
         {/* Header */}
         <div className="text-center mb-8">
           <div className="flex items-center justify-center space-x-2 mb-4">
-            <div className="w-10 h-10 bg-gradient-to-r from-blue-600 to-purple-600 rounded-lg flex items-center justify-center">
-              <Brain className="w-6 h-6 text-white" />
+            <div className="h-10 rounded-lg flex items-center justify-center">
+              <img 
+                src="/logo.png" 
+                alt="強茂集團 AI 展示平台" 
+                className="h-10 object-contain"
+              />
             </div>
             <div>
               <h1 className="text-2xl font-bold text-gray-900">強茂集團 AI 展示平台</h1>