feat: 智能体管理增加上线开关、标签、可使用工具

智能体新增功能：
- 上线开关(is_online)：点击快速切换，未上线则APP不可见
- 标签(tags)：支持多标签，逗号分隔(hot/popular/new等)
- 可使用工具(enable_tools)：配置智能体可用的工具列表

类别调整：
- 热门改为标签，不再是类别
- 类别改为: basic/work/study/life
- hot=热门标签, popular=推荐标签, new=新品标签

数据库变更：
- agents表新增 is_online 字段
- agents表新增 enable_tools 字段
- 移除 enable_search 字段(改为工具)

API新增：
- /api/admin/agents/<id>/online 切换上线状态
- 前端配置只返回上线且活跃的智能体

www/admin.js

@@ -361,14 +361,22 @@ async function deleteLLM(id) {
 async function loadAgentsPage(content) {
   agents = await fetchAPI('/api/admin/agents');
   llmConfigs = await fetchAPI('/api/admin/llm');
+  toolConfigs = await fetchAPI('/api/admin/tools');
   
   const categories = {
-    hot: '热门',
+    basic: '基础',
     work: '工作',
     study: '学习',
     life: '生活'
   };
   
+  const tagLabels = {
+    'hot': '🔥 热门',
+    'popular': '👍 推荐',
+    'new': '🆕 新品',
+    '': ''
+  };
+  
   content.innerHTML = `
     <div class="content-header">
       <h1 class="content-title">智能体管理</h1>
@@ -382,9 +390,9 @@ async function loadAgentsPage(content) {
             <th>头像</th>
             <th>名称</th>
             <th>类别</th>
-            <th>描述</th>
+            <th>标签</th>
             <th>热度</th>
-            <th>状态</th>
+            <th>上线状态</th>
             <th>操作</th>
           </tr>
         </thead>
@@ -394,9 +402,13 @@ async function loadAgentsPage(content) {
               <td style="font-size: 24px;">${a.avatar}</td>
               <td>${a.name}</td>
               <td>${categories[a.category] || a.category}</td>
-              <td style="max-width: 200px; overflow: hidden; text-overflow: ellipsis;">${a.description || '-'}</td>
+              <td>${a.tags ? a.tags.split(',').map(t => tagLabels[t] || t).filter(t => t).join(' ') : '-'}</td>
               <td>${a.heat || 0}</td>
-              <td>${a.is_active ? '✅ 启用' : '❌ 禁用'}</td>
+              <td>
+                <span style="cursor: pointer; color: ${a.is_online ? '#22c55e' : '#e53e3e'};" onclick="toggleAgentOnline('${a.agent_id}', ${a.is_online})">
+                  ${a.is_online ? '✅ 已上线' : '❌ 未上线'}
+                </span>
+              </td>
               <td>
                 <div class="action-btns">
                   <button class="action-btn edit" onclick="showEditAgentModal('${a.agent_id}')">编辑</button>
@@ -408,9 +420,34 @@ async function loadAgentsPage(content) {
         </tbody>
       </table>
     </div>
+    
+    <div style="margin-top: 24px; padding: 16px; background: white; border-radius: 12px;">
+      <h3 style="margin-bottom: 16px;">说明</h3>
+      <div style="display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px;">
+        <div style="padding: 12px; background: #f5f7fa; border-radius: 8px;">
+          <strong>上线状态</strong>
+          <p style="color: #718096; font-size: 12px; margin-top: 4px;">点击可快速切换，未上线则APP不可见</p>
+        </div>
+        <div style="padding: 12px; background: #f5f7fa; border-radius: 8px;">
+          <strong>标签</strong>
+          <p style="color: #718096; font-size: 12px; margin-top: 4px;">hot=热门, popular=推荐, new=新品</p>
+        </div>
+        <div style="padding: 12px; background: #f5f7fa; border-radius: 8px;">
+          <strong>类别</strong>
+          <p style="color: #718096; font-size: 12px; margin-top: 4px;">basic/work/study/life</p>
+        </div>
+      </div>
+    </div>
   `;
 }
 
+async function toggleAgentOnline(agentId, currentStatus) {
+  const newStatus = currentStatus ? 0 : 1;
+  await fetchAPI(`/api/admin/agents/${agentId}/online`, 'POST', { is_online: newStatus });
+  showToast(newStatus ? '已上线' : '已下线');
+  loadPage('agents');
+}
+
 function showAddAgentModal() {
   showModal('添加智能体', `
     <div class="form-group">
@@ -432,12 +469,51 @@ function showAddAgentModal() {
     <div class="form-group">
       <label class="form-label">类别</label>
       <select class="form-select" id="agentCategory">
-        <option value="hot">热门</option>
+        <option value="basic">基础</option>
         <option value="work">工作</option>
         <option value="study">学习</option>
         <option value="life">生活</option>
       </select>
     </div>
+    <div class="form-group">
+      <label class="form-label">标签（逗号分隔）</label>
+      <input type="text" class="form-input" id="agentTags" placeholder="如：hot,popular">
+      <span style="color: #999; font-size: 12px;">可选: hot(热门), popular(推荐), new(新品)</span>
+    </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（可选）</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('')}
+      </select>
+    </div>
+    <div class="form-group">
+      <label class="form-label">可使用工具（逗号分隔）</label>
+      <input type="text" class="form-input" id="agentEnableTools" placeholder="如：search,calculator">
+      <span style="color: #999; font-size: 12px;">已配置工具: ${toolConfigs.map(t => t.tool_id).join(', ')}</span>
+    </div>
+    <div class="form-group">
+      <label class="form-label">热度</label>
+      <input type="number" class="form-input" id="agentHeat" value="0">
+    </div>
+    <div class="form-group">
+      <label style="display: flex; align-items: center; gap: 8px;">
+        <input type="checkbox" id="agentIsOnline" checked> 立即上线
+      </label>
+    </div>
+    <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">
@@ -494,12 +570,17 @@ function showEditAgentModal(agentId) {
     <div class="form-group">
       <label class="form-label">类别</label>
       <select class="form-select" id="agentCategory">
-        <option value="hot" ${agent.category === 'hot' ? 'selected' : ''}>热门</option>
+        <option value="basic" ${agent.category === 'basic' ? 'selected' : ''}>基础</option>
         <option value="work" ${agent.category === 'work' ? 'selected' : ''}>工作</option>
         <option value="study" ${agent.category === 'study' ? 'selected' : ''}>学习</option>
         <option value="life" ${agent.category === 'life' ? 'selected' : ''}>生活</option>
       </select>
     </div>
+    <div class="form-group">
+      <label class="form-label">标签（逗号分隔）</label>
+      <input type="text" class="form-input" id="agentTags" value="${agent.tags || ''}">
+      <span style="color: #999; font-size: 12px;">可选: hot(热门), popular(推荐), new(新品)</span>
+    </div>
     <div class="form-group">
       <label class="form-label">描述</label>
       <input type="text" class="form-input" id="agentDescription" value="${agent.description || ''}">
@@ -509,23 +590,24 @@ function showEditAgentModal(agentId) {
       <textarea class="form-textarea" id="agentPrompt">${agent.system_prompt || ''}</textarea>
     </div>
     <div class="form-group">
-      <label class="form-label">LLM配置</label>
+      <label class="form-label">LLM配置（可选）</label>
       <select class="form-select" id="agentLLM">
-        <option value="">使用默认</option>
+        <option value="" ${!agent.llm_config_id ? 'selected' : ''}>使用默认</option>
         ${llmConfigs.map(c => `<option value="${c.id}" ${c.id === agent.llm_config_id ? 'selected' : ''}>${c.name}</option>`).join('')}
       </select>
     </div>
+    <div class="form-group">
+      <label class="form-label">可使用工具（逗号分隔）</label>
+      <input type="text" class="form-input" id="agentEnableTools" value="${agent.enable_tools || ''}">
+      <span style="color: #999; font-size: 12px;">已配置工具: ${toolConfigs.map(t => t.tool_id).join(', ')}</span>
+    </div>
     <div class="form-group">
       <label class="form-label">热度</label>
       <input type="number" class="form-input" id="agentHeat" value="${agent.heat || 0}">
     </div>
-    <div class="form-group">
-      <label class="form-label">标签</label>
-      <input type="text" class="form-input" id="agentTags" value="${agent.tags || ''}">
-    </div>
     <div class="form-group">
       <label style="display: flex; align-items: center; gap: 8px;">
-        <input type="checkbox" id="agentEnableSearch" ${agent.enable_search ? 'checked' : ''}> 启用联网搜索
+        <input type="checkbox" id="agentIsOnline" ${agent.is_online ? 'checked' : ''}> 已上线
       </label>
     </div>
     <button class="form-submit" onclick="updateAgent('${agentId}')">保存</button>
@@ -538,12 +620,13 @@ async function saveAgent() {
     name: document.getElementById('agentName').value,
     avatar: document.getElementById('agentAvatar').value,
     category: document.getElementById('agentCategory').value,
+    tags: document.getElementById('agentTags').value,
     description: document.getElementById('agentDescription').value,
     system_prompt: document.getElementById('agentPrompt').value,
     llm_config_id: document.getElementById('agentLLM').value || null,
+    enable_tools: document.getElementById('agentEnableTools').value,
     heat: parseInt(document.getElementById('agentHeat').value),
-    tags: document.getElementById('agentTags').value,
-    enable_search: document.getElementById('agentEnableSearch').checked ? 1 : 0
+    is_online: document.getElementById('agentIsOnline').checked ? 1 : 0
   };
   
   if (!data.agent_id || !data.name || !data.system_prompt) {
@@ -562,12 +645,13 @@ async function updateAgent(agentId) {
     name: document.getElementById('agentName').value,
     avatar: document.getElementById('agentAvatar').value,
     category: document.getElementById('agentCategory').value,
+    tags: document.getElementById('agentTags').value,
     description: document.getElementById('agentDescription').value,
     system_prompt: document.getElementById('agentPrompt').value,
     llm_config_id: document.getElementById('agentLLM').value || null,
+    enable_tools: document.getElementById('agentEnableTools').value,
     heat: parseInt(document.getElementById('agentHeat').value),
-    tags: document.getElementById('agentTags').value,
-    enable_search: document.getElementById('agentEnableSearch').checked ? 1 : 0
+    is_online: document.getElementById('agentIsOnline').checked ? 1 : 0
   };
   
   await fetchAPI(`/api/admin/agents/${agentId}`, 'PUT', data);