fix(navigation): 增强移动端底部导航样式和调试

- mobile-nav 背景改为蓝色(#1890ff)，文字白色，便于确认渲染
- 增加渲染日志（侧边栏/移动端项目数量）
- 确保所有页面都使用同一组件，统一显示

platform/frontend/navigation-component.js

@@ -1,4 +1,4 @@
-// Vue 3 导航组件 - 最终版（确保事件传递）
+// Vue 3 导航组件 - 最终版（增强调试和样式）
 (function() {
   console.log('[Nav] 脚本加载');
 
@@ -20,15 +20,16 @@
       .navigation-wrapper .sidebar-btn:hover { background: #f5f7fa; color: #409eff; }
       .navigation-wrapper .sidebar-btn.active { background: #ecf5ff; color: #409eff; font-weight: 600 !important; }
       .navigation-wrapper .mobile-nav {
-        display: none; position: fixed; bottom: 0; left: 0; right: 0; background: white;
+        display: none; position: fixed; bottom: 0; left: 0; right: 0; background: #1890ff;
-        box-shadow: 0 -2px 8px rgba(0,0,0,0.1); padding: 8px 0; z-index: 99999; justify-content: space-around;
+        box-shadow: 0 -2px 8px rgba(0,0,0,0.2); padding: 8px 0; z-index: 99999; justify-content: space-around;
       }
       .navigation-wrapper .mobile-nav-btn {
         flex: 1; border: none; background: transparent; padding: 10px 4px; text-align: center;
-        font-size: 11px; color: #606266; cursor: pointer; display: flex; flex-direction: column; align-items: center; gap: 2px;
+        font-size: 12px; color: white !important; cursor: pointer; display: flex; flex-direction: column; align-items: center; gap: 2px;
+        transition: background 0.2s;
       }
-      .navigation-wrapper .mobile-nav-btn:hover { color: #409eff; }
+      .navigation-wrapper .mobile-nav-btn:hover { background: rgba(255,255,255,0.2); color: white !important; }
-      .navigation-wrapper .mobile-nav-btn.active { color: #409eff; font-weight: 600 !important; }
+      .navigation-wrapper .mobile-nav-btn.active { background: rgba(255,255,255,0.3); font-weight: 600 !important; }
       @media (max-width: 768px) {
         .navigation-wrapper .sidebar { display: none !important; }
         .navigation-wrapper .mobile-nav { display: flex !important; }
@@ -70,21 +71,17 @@
     const component = {
       name: 'NavigationComponent',
       props: { currentPage: { type: String, required: true }, isAdmin: { type: Boolean, default: false } },
-      mounted() { console.log('[NavigationComponent] 已挂载'); },
+      mounted() { console.log('[NavigationComponent] 已挂载，isAdmin:', this.isAdmin); },
       render(){
         const createElement = arguments[0] || h;
-        // 获取 emit 方法：通过 this.$emit 或从闭包中捕获
         const emit = this.$emit || function() {};
         
         const navigate = (page) => {
           console.log('[NavigationComponent] 点击导航到:', page);
-          // 直接调用 emit 函数
           if (typeof emit === 'function') {
             emit('navigate', page);
           } else if (this.$emit) {
             this.$emit('navigate', page);
-          } else {
-            console.warn('[NavigationComponent] 无法发送事件，emit unavailable');
           }
         };
 
@@ -101,6 +98,8 @@
           ...(this.isAdmin ? [{ icon: '👥', label: '用户', page: 'users.html' }, { icon: '⚙️', label: '系统', page: 'admin.html' }] : [])
         ];
 
+        console.log('[NavigationComponent] 渲染侧边栏项目:', sidebarItems.length, '移动端项目:', mobileItems.length);
+
         return createElement('div', { class: 'navigation-wrapper' }, [
           createElement('aside', { class: 'sidebar' }, [
             createElement('div', { class: 'sidebar-header' }, [createElement('h3', '宇之然平台')]),