feat: Agent 运行时、对话 API、作业助手与引擎修复及前端执行超时

- agent_runtime 模块与 agent_chat API，前端 AgentChat 视图与路由对接
- workflow_engine: code 节点命名空间与 json 引用修复
- llm_service: 工具调用 extra_body（如 DeepSeek）
- create_homework_manager_agent / _3 脚本与测试脚本扩展
- frontend: WORKFLOW_EXECUTION_HTTP_TIMEOUT_MS、AgentChatPreview/MainLayout 等
- 文档：架构说明与自主 Agent 改造完成情况

Made-with: Cursor

frontend/src/components/AgentChatPreview.vue

@@ -244,7 +244,7 @@ import {
   Promotion,
   Document
 } from '@element-plus/icons-vue'
-import api from '@/api'
+import api, { WORKFLOW_EXECUTION_HTTP_TIMEOUT_MS } from '@/api'
 import { useUserStore } from '@/stores/user'
 
 interface Message {
@@ -404,6 +404,14 @@ function getPreviewContextUserId(agentId: string): string {
   return getPreviewSessionUserId(agentId)
 }
 
+/** 本轮发送前已有对话（不含即将追加的当前用户句），供后端注入 LLM 上下文 */
+function conversationHistoryPayloadBeforeNewUserTurn(): Array<{ role: string; content: string }> {
+  return messages.value.map((m) => ({
+    role: m.role === 'user' ? 'user' : 'assistant',
+    content: typeof m.content === 'string' ? m.content : String(m.content ?? '')
+  }))
+}
+
 /** 未登录时的浏览器会话 id（见 agent记忆实现方案.md） */
 function getPreviewSessionUserId(agentId: string): string {
   const key = `agent_preview_uid_${agentId}`
@@ -846,6 +854,8 @@ const handleSendMessage = async () => {
     userBubble = head
   }
 
+  const conversation_history = conversationHistoryPayloadBeforeNewUserTurn()
+
   // 添加用户消息
   const userAttachments: MessageAttachment[] = attachSnap.map((a) => ({
     relative_path: a.relative_path,
@@ -870,15 +880,21 @@ const handleSendMessage = async () => {
   // 发送到Agent
   loading.value = true
   try {
-    const response = await api.post('/api/v1/executions', {
-      agent_id: props.agentId,
-      input_data: {
-        USER_INPUT: mergedForModel,
-        query: mergedForModel,
-        user_id: getPreviewContextUserId(props.agentId),
-        attachments: attachSnap
-      }
-    })
+    const response = await api.post(
+      '/api/v1/executions',
+      {
+        agent_id: props.agentId,
+        input_data: {
+          USER_INPUT: mergedForModel,
+          query: mergedForModel,
+          user_id: getPreviewContextUserId(props.agentId),
+          attachments: attachSnap,
+          conversation_history,
+          memory: { conversation_history }
+        }
+      },
+      { timeout: WORKFLOW_EXECUTION_HTTP_TIMEOUT_MS }
+    )
     
     const execution = response.data
     blobsPendingRevokeAfterRun.value = attachSnap.length ? attachSnap : null
@@ -904,14 +920,18 @@ const handleSendMessage = async () => {
         }
         
         // 获取详细执行状态（包含节点执行信息）
-        const statusResponse = await api.get(`/api/v1/executions/${execution.id}/status`)
+        const statusResponse = await api.get(`/api/v1/executions/${execution.id}/status`, {
+          timeout: WORKFLOW_EXECUTION_HTTP_TIMEOUT_MS
+        })
         const status = statusResponse.data
         
         // 将执行状态传递给父组件，用于显示工作流动画
         emit('execution-status', status)
         
         // 获取执行详情（用于提取输出结果）
-        const execResponse = await api.get(`/api/v1/executions/${execution.id}`)
+        const execResponse = await api.get(`/api/v1/executions/${execution.id}`, {
+          timeout: WORKFLOW_EXECUTION_HTTP_TIMEOUT_MS
+        })
         const exec = execResponse.data
         
         if (exec.status === 'completed') {

frontend/src/components/MainLayout.vue

@@ -31,6 +31,10 @@
             <el-icon><User /></el-icon>
             <span>Agent管理</span>
           </el-menu-item>
+          <el-menu-item index="agent-chat" @click="router.push('/agent-chat')">
+            <el-icon><ChatLineSquare /></el-icon>
+            <span>Agent对话</span>
+          </el-menu-item>
           <el-menu-item index="executions">
             <el-icon><List /></el-icon>
             <span>执行历史</span>