feat: 添加搜索工具功能（Tavily Search）

- 新增 SearchToolConfig 模型：支持搜索工具配置
- Agent 增加 tools 字段：可配置可用工具列表
- 后台管理增加搜索工具配置页面
- Agent 管理增加工具启用开关
- 网页端增加搜索工具禁用复选框
- WebSocket chat 处理增加搜索调用逻辑
- 默认配置 Tavily Search API

templates/index.html

@@ -32,6 +32,9 @@
         .agent-selector select { padding: 8px 12px; border: 1px solid #ddd; border-radius: 8px; font-size: 14px; cursor: pointer; min-width: 150px; }
         .ws-status { font-size: 12px; color: #666; background: #f0f0f0; padding: 4px 8px; border-radius: 4px; }
         .ws-status.connected { color: #10a37f; }
+        .tool-toggle { display: flex; align-items: center; gap: 6px; font-size: 12px; }
+        .tool-toggle input { width: 14px; height: 14px; }
+        .tool-toggle label { cursor: pointer; }
         
         .messages-container { flex: 1; overflow-y: auto; padding: 24px; }
         .message { max-width: 800px; margin: 0 auto 24px; display: flex; gap: 16px; }
@@ -141,6 +144,10 @@
                 <div class="agent-selector">
                     <select id="agentSelect" onchange="switchAgent()"><option value="">加载中...</option></select>
                 </div>
+                <div class="tool-toggle">
+                    <input type="checkbox" id="enableSearch" checked>
+                    <label for="enableSearch"><i class="ri-search-line"></i> 搜索</label>
+                </div>
                 <div class="ws-status" id="wsStatus">连接中...</div>
             </div>
         </div>
@@ -676,8 +683,20 @@
             document.getElementById('sendBtn').disabled = true;
             input.value = '';
             input.style.height = 'auto';
+            
+            // 获取工具禁用状态
+            const enableSearch = document.getElementById('enableSearch').checked;
+            const disabledTools = [];
+            if (!enableSearch) disabledTools.push('search');
+            
             if (ws?.readyState === WebSocket.OPEN) {
-                ws.send(JSON.stringify({ action: 'chat', message: msg, conversation_id: currentConversationId, agent_id: currentAgentId }));
+                ws.send(JSON.stringify({ 
+                    action: 'chat', 
+                    message: msg, 
+                    conversation_id: currentConversationId, 
+                    agent_id: currentAgentId,
+                    disabled_tools: disabledTools  // 禁用的工具列表
+                }));
             }
         }