fix: 修复用户菜单显示问题和真实用户名显示

- 修复登录接口返回真实用户名而非输入用户名
- 新增获取当前用户信息的API接口(/web/auth/user)
- 修复前端用户名显示逻辑，页面初始化时获取真实用户名
- 提高下拉菜单z-index确保正确显示
- 解决用户名显示为Admin而非data/init.json中真实用户名的问题

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

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

src/routes/web.js

@@ -114,7 +114,8 @@ router.post('/auth/login', async (req, res) => {
     res.json({
       success: true,
       token: sessionId,
-      expiresIn: config.security.adminSessionTimeout
+      expiresIn: config.security.adminSessionTimeout,
+      username: adminData.username // 返回真实用户名
     });
 
   } catch (error) {
@@ -252,6 +253,54 @@ router.post('/auth/change-password', async (req, res) => {
   }
 });
 
+// 👤 获取当前用户信息
+router.get('/auth/user', async (req, res) => {
+  try {
+    const token = req.headers['authorization']?.replace('Bearer ', '') || req.cookies?.adminToken;
+    
+    if (!token) {
+      return res.status(401).json({
+        error: 'No token provided',
+        message: 'Authentication required'
+      });
+    }
+
+    // 获取当前会话
+    const sessionData = await redis.getSession(token);
+    if (!sessionData) {
+      return res.status(401).json({
+        error: 'Invalid token',
+        message: 'Session expired or invalid'
+      });
+    }
+
+    // 获取管理员信息
+    const adminData = await redis.getSession('admin_credentials');
+    if (!adminData) {
+      return res.status(500).json({
+        error: 'Admin data not found',
+        message: 'Administrator credentials not found'
+      });
+    }
+
+    res.json({
+      success: true,
+      user: {
+        username: adminData.username,
+        loginTime: sessionData.loginTime,
+        lastActivity: sessionData.lastActivity
+      }
+    });
+
+  } catch (error) {
+    logger.error('❌ Get user info error:', error);
+    res.status(500).json({
+      error: 'Get user info failed',
+      message: 'Internal server error'
+    });
+  }
+});
+
 // 🔄 刷新token
 router.post('/auth/refresh', async (req, res) => {
   try {

web/admin/app.js

@@ -228,6 +228,9 @@ const app = createApp({
         if (this.authToken) {
             this.isLoggedIn = true;
             
+            // 加载当前用户信息
+            this.loadCurrentUser();
+            
             // 初始化日期筛选器和图表数据
             this.initializeDateFilter();
             
@@ -808,8 +811,8 @@ const app = createApp({
                     localStorage.setItem('authToken', this.authToken);
                     this.isLoggedIn = true;
                     
-                    // 记录当前用户名
+                    // 记录当前用户名（使用服务器返回的真实用户名）
-                    this.currentUser.username = this.loginForm.username;
+                    this.currentUser.username = data.username;
                     
                     this.loadDashboard();
                 } else {
@@ -823,6 +826,26 @@ const app = createApp({
             }
         },
         
+        // 加载当前用户信息
+        async loadCurrentUser() {
+            try {
+                const response = await fetch('/web/auth/user', {
+                    headers: { 'Authorization': 'Bearer ' + this.authToken }
+                });
+                
+                const data = await response.json();
+                
+                if (data.success) {
+                    this.currentUser.username = data.user.username;
+                    console.log('Loaded current user:', data.user.username);
+                } else {
+                    console.warn('Failed to load current user:', data.message);
+                }
+            } catch (error) {
+                console.error('Error loading current user:', error);
+            }
+        },
+        
         // 用户菜单相关方法
         openChangePasswordModal() {
             this.userMenuOpen = false;

web/admin/index.html

@@ -97,7 +97,8 @@
                         <!-- 悬浮菜单 -->
                         <div 
                             v-if="userMenuOpen" 
-                            class="absolute right-0 top-full mt-2 w-48 bg-white rounded-xl shadow-xl border border-gray-200 py-2 z-50"
+                            class="absolute right-0 top-full mt-2 w-48 bg-white rounded-xl shadow-xl border border-gray-200 py-2"
+                            style="z-index: 9999;"
                             @click.stop
                         >
                             <button