fix: 修复admin.js语法错误

www/admin.js

@@ -512,21 +512,8 @@ function showAddAgentModal() {
     <button class="form-submit" onclick="saveAgent()">保存</button>
   `);
 }
-      </select>
-    </div>
-    <div class="form-group">
-      <label class="form-label">描述</label>
-      <input type="text" class="form-input" id="agentDescription" placeholder="智能体描述">
-    </div>
-    <div class="form-group">
-      <label class="form-label">System Prompt</label>
-      <textarea class="form-textarea" id="agentPrompt" placeholder="系统提示词"></textarea>
-    </div>
-    <div class="form-group">
-      <label class="form-label">LLM配置</label>
-      <select class="form-select" id="agentLLM">
-        <option value="">使用默认</option>
-        ${llmConfigs.map(c => `<option value="${c.id}">${c.name}</option>`).join('')}
+
+function showEditAgentModal(agentId) {
       </select>
     </div>
     <div class="form-group">