feat: 优化会展策划网站UI和添加Duoduo Agent设计流程展示

主要更新:
- 统一所有页面导航栏样式为glass-morphism风格
- 添加Duoduo Agent智能设计系统完整可视化流程
- 展示从CAD到展位概念的5个设计阶段
- 优化页面交互效果和用户体验

详细修改:
- web_frontend/web_result/pages/: 统一6个页面导航栏样式
- operation.html: 新增Duoduo Agent设计流程展示模块
- 添加5张设计阶段图片展示 (CAD/概念/白模/渲染/最终方案)
- 增强视觉效果和动画交互

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

web_frontend/exhibition-demo/src/pages/WorkflowPageV4.tsx

@@ -767,11 +767,28 @@ const WorkflowPageV4 = () => {
   };
 
   return (
-    <div className="h-screen bg-gray-50 flex flex-col">
+    <div className="h-screen bg-gray-50 flex flex-col relative">
+      {/* 背景图片和蒙版 */}
+      <div className="absolute inset-0 z-0">
+        <div 
+          className="absolute inset-0" 
+          style={{
+            backgroundImage: 'url(/images/Whisk_e8f83d1a37.jpg)',
+            backgroundSize: 'cover',
+            backgroundPosition: 'center',
+            backgroundRepeat: 'no-repeat',
+            opacity: 0.15
+          }}
+        />
+        <div className="absolute inset-0 bg-gradient-to-br from-gray-900/30 via-purple-900/20 to-blue-900/30" />
+      </div>
+      
+      {/* 主内容容器 */}
+      <div className="relative z-10 h-full flex flex-col">
       {/* 顶部控制栏 */}
       <div className="bg-white border-b border-gray-200 px-6 py-3 flex items-center justify-between">
         <div className="flex items-center gap-4">
-          <h1 className="text-lg font-semibold text-gray-900">AI会展策划系统 - 多Agent协同演示</h1>
+          <h1 className="text-lg font-semibold text-gray-900">DuoDuo Agent - 多智能体协同生成·专业方案</h1>
           <div className="flex items-center gap-2">
             <button
               onClick={status === 'idle' ? () => setShowRequirementModal(true) : pauseDemo}
@@ -809,9 +826,9 @@ const WorkflowPageV4 = () => {
       </div>
 
       {/* 主内容区 */}
-      <div className="flex-1 flex overflow-hidden">
+      <div className="flex-1 flex overflow-hidden backdrop-blur-sm">
         {/* 左侧：n8n工作流 */}
-        <div className="w-1/2 border-r border-gray-200 bg-white flex flex-col">
+        <div className="w-1/2 border-r border-gray-200 bg-white/95 backdrop-blur-md flex flex-col">
           <div className="px-4 py-2 border-b border-gray-200 flex items-center justify-between bg-gray-50">
             <div className="flex items-center gap-2">
               <div className="w-3 h-3 rounded-full bg-green-500"></div>
@@ -1026,6 +1043,7 @@ const WorkflowPageV4 = () => {
           </div>
         </div>
       </div>
+      </div>
 
       {/* 弹窗组件 */}
       <RequirementModal