🔧 添加全局主题设置调试日志

添加console.log帮助诊断全局主题设置不生效的问题

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

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

frontend/app.js

@@ -352,21 +352,30 @@ createApp({
     // 设置全局主题（管理员）
     async setGlobalTheme(theme) {
       try {
+        console.log('[主题] 设置全局主题:', theme);
         const res = await axios.post(`${this.apiBase}/api/admin/settings`,
           { global_theme: theme },
           { headers: { Authorization: `Bearer ${this.token}` }}
         );
+        console.log('[主题] API响应:', res.data);
         if (res.data.success) {
           this.globalTheme = theme;
+          console.log('[主题] globalTheme已更新为:', this.globalTheme);
           // 如果用户没有设置个人偏好，则跟随全局
           if (this.userThemePreference === null) {
             this.currentTheme = theme;
             this.applyTheme(theme);
             localStorage.setItem('theme', theme);
+          } else {
+            console.log('[主题] 用户有个人偏好，不更改当前显示主题:', this.userThemePreference);
           }
           this.showToast('success', '全局主题已更新', theme === 'dark' ? '默认暗色主题' : '默认亮色主题');
+        } else {
+          console.error('[主题] API返回失败:', res.data);
+          this.showToast('error', '设置失败', res.data.message || '未知错误');
         }
       } catch (error) {
+        console.error('[主题] 设置全局主题失败:', error);
         this.showToast('error', '设置失败', error.response?.data?.message || '请稍后重试');
       }
     },
@@ -2302,8 +2311,10 @@ handleDragLeave(e) {
           const settings = response.data.settings;
           this.systemSettings.maxUploadSizeMB = Math.round(settings.max_upload_size / (1024 * 1024));
           // 加载全局主题设置
+          console.log('[主题] 从服务器加载全局主题:', settings.global_theme);
           if (settings.global_theme) {
             this.globalTheme = settings.global_theme;
+            console.log('[主题] globalTheme已设置为:', this.globalTheme);
           }
           if (settings.smtp) {
             this.systemSettings.smtp.host = settings.smtp.host || '';