chore: 清理 Docker 相关文件并优化前端布局

- 删除 Docker 相关文件 (docker-compose, Dockerfile, nginx.conf, init.sql 等)
- 优化 platforms.html 卡片布局和响应式样式
- 优化 users.html 格式和移动端卡片设计
- 优化 admin.html 页面结构和表格布局
- 修复各页面 min-height 和溢出问题
- 更新导航组件样式

platform/frontend/topics.html

@@ -16,7 +16,7 @@
         .navbar-user { display: flex; align-items: center; gap: 16px; }
         .user-info { display: flex; align-items: center; gap: 8px; }
         .avatar { width: 32px; height: 32px; border-radius: 50%; background: rgba(255,255,255,0.2); display: flex; align-items: center; justify-content: center; font-size: 14px; }
-        .main-content { display: flex; flex: 1; max-width: 1400px; margin: 0 auto; width: 100%; }
+        .main-content { display: flex; flex: 1; max-width: 1400px; margin: 0 auto; }
         .sidebar { width: 180px; background: white; padding: 12px; box-shadow: 2px 0 8px rgba(0,0,0,0.05); }
         
         
@@ -600,8 +600,8 @@ const TopicsApp = {
                     })
                     .catch(() => {});
             },
-        handleLogout() { localStorage.removeItem('authToken'); window.location.href = '/'; },
-        redirectToPage(page) { window.location.href = page; },
+        handleLogout() { localStorage.removeItem('authToken'); localStorage.removeItem('userRole'); localStorage.removeItem('currentUser'); window.location.href = '/login.html'; },
+        redirectToPage(page) { window.location.href = page.startsWith('/') ? page : '/' + page; },
         getStatusLabel(status) {
             const statusMap = {
                 'pending': '待处理',
@@ -647,7 +647,7 @@ const TopicsApp = {
         console.log('[DEBUG] TopicsApp mounted');
         const token = localStorage.getItem('authToken');
         console.log('[DEBUG] Token exists:', !!token);
-        if (!token) { window.location.href = '/'; return; }
+        if (!token) { window.location.href = '/login.html'; return; }
         // 解析 URL filter 参数
         const urlParams = new URLSearchParams(window.location.search);
         const filter = urlParams.get('filter');
@@ -662,7 +662,7 @@ const TopicsApp = {
                 this.isLoggedIn = true; 
                 this.fetchTopics(); 
             })
-            .catch(() => { localStorage.removeItem('authToken'); window.location.href = '/'; });
+            .catch(() => { localStorage.removeItem('authToken'); localStorage.removeItem('userRole'); localStorage.removeItem('currentUser'); window.location.href = '/login.html'; });
     }
 };
 const app = Vue.createApp(TopicsApp);