fix: 发现页面条件判断缺少结尾

www/app.js

@@ -1127,22 +1127,27 @@ function showAgentDiscoverPage() {
             ${workAgents.map(agent => renderDiscoverCard(agent)).join('')}
           </div>
         </div>
+        ` : ''}
         
         <!-- 学习助手 -->
+        ${studyAgents.length > 0 ? `
         <div class="discover-section">
           <div class="discover-section-title">📚 学习助手</div>
           <div class="discover-grid" id="discoverStudyGrid">
             ${studyAgents.map(agent => renderDiscoverCard(agent)).join('')}
           </div>
         </div>
+        ` : ''}
         
         <!-- 生活助手 -->
+        ${lifeAgents.length > 0 ? `
         <div class="discover-section">
           <div class="discover-section-title">🏠 生活助手</div>
           <div class="discover-grid" id="discoverLifeGrid">
             ${lifeAgents.map(agent => renderDiscoverCard(agent)).join('')}
           </div>
         </div>
+        ` : ''}
       </div>
     </div>
   `;