feat: 更新 Server 后端服务

- 更新 agent handler 和 service 层
- 新增 chat_group handler 和 service
- 删除废弃的 chat_handler
- 更新 tool 相关处理
- 更新 API 文档和依赖

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/internal/handler/agent_handler.go

@@ -2,6 +2,7 @@ package handler
 
 import (
 	"net/http"
+	"strconv"
 
 	"x-agents/server/internal/service"
 
@@ -22,7 +23,7 @@ func NewAgentHandler(agentService *service.AgentService) *AgentHandler {
 
 // ChatRequest 对话请求
 type ChatRequest struct {
-	AgentID   int    `json:"agent_id" binding:"required"`
+	AgentID   string `json:"agent_id" binding:"required"` // 字符串类型
 	Message   string `json:"message" binding:"required"`
 	SessionID string `json:"session_id"`
 	ModelID   string `json:"model_id"`
@@ -69,10 +70,14 @@ func (h *AgentHandler) Chat(c *gin.Context) {
 	}
 
 	// 获取用户 ID（从认证中间件获取）
-	userID := 1 // TODO: 从 c.Get("user_id") 获取
+	userIDStr := "1" // TODO: 从 c.Get("user_id") 获取
+	userID, _ := strconv.Atoi(userIDStr)
+
+	// 将前端传来的字符串 agent_id 转换为 int
+	agentID, _ := strconv.Atoi(req.AgentID)
 
 	pythonReq := service.AgentChatRequest{
-		AgentID:   req.AgentID,
+		AgentID:   agentID,
 		Message:   req.Message,
 		UserID:    userID,
 		SessionID: req.SessionID,
@@ -122,7 +127,11 @@ func (h *AgentHandler) ChatStream(c *gin.Context) {
 	}
 
 	// 获取用户 ID
-	userID := 1 // TODO: 从 c.Get("user_id") 获取
+	userIDStr := "1" // TODO: 从 c.Get("user_id") 获取
+	userID, _ := strconv.Atoi(userIDStr)
+
+	// 将前端传来的字符串 agent_id 转换为 int
+	agentID, _ := strconv.Atoi(req.AgentID)
 
 	// 构建 SSE 流
 	c.Header("Content-Type", "text/event-stream")
@@ -131,7 +140,7 @@ func (h *AgentHandler) ChatStream(c *gin.Context) {
 	c.Header("Access-Control-Allow-Origin", "*")
 
 	// 调用 Python 服务的流式端点
-	err := h.agentService.ChatStream(c, req.AgentID, req.Message, req.SessionID, req.ModelID, userID)
+	err := h.agentService.ChatStream(c, agentID, req.Message, req.SessionID, req.ModelID, userID)
 	if err != nil && !c.IsAborted() {
 		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
 	}
@@ -173,7 +182,8 @@ func (h *AgentHandler) TeamChat(c *gin.Context) {
 	}
 
 	// 获取用户 ID
-	userID := 1 // TODO: 从 c.Get("user_id") 获取
+	userIDStr := "1" // TODO: 从 c.Get("user_id") 获取
+	userID, _ := strconv.Atoi(userIDStr)
 
 	pythonReq := service.TeamChatRequest{
 		SupervisorAgentID: req.SupervisorAgentID,