feat: 更新后端agent和skill服务

- agent_handler.go: 新增ListAgents、CreateAgent接口
- skill_handler.go: 更新skill内容获取和保存功能
- agent_service.go: 新增agent服务逻辑
- main.go: 新增agent路由

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

server/internal/handler/agent_handler.go

@@ -40,7 +40,27 @@ type ChatResponse struct {
 	Metadata   interface{} `json:"metadata"`
 }
 
+
+// CreateAgentResponse 创建智能体响应
+type CreateAgentResponse struct {
+	AgentID int    `json:"agent_id"`
+	Name    string `json:"name"`
+	Message string `json:"message"`
+}
+
+// ListAgentsResponse 获取智能体列表响应
+type ListAgentsResponse struct {
+	Agents []interface{} `json:"agents"`
+}
+
 // Chat 单智能体对话
+// @Summary 单智能体对话
+// @Tags 智能体管理
+// @Accept json
+// @Produce json
+// @Param request body ChatRequest true "对话请求"
+// @Success 200 {object} ChatResponse
+// @Router /api/agent/chat [post]
 func (h *AgentHandler) Chat(c *gin.Context) {
 	var req ChatRequest
 	if err := c.ShouldBindJSON(&req); err != nil {
@@ -88,6 +108,12 @@ func (h *AgentHandler) Chat(c *gin.Context) {
 }
 
 // ChatStream 单智能体对话（流式输出）
+// @Summary 单智能体对话（流式输出）
+// @Tags 智能体管理
+// @Accept json
+// @Produce text/event-stream
+// @Param request body ChatRequest true "对话请求"
+// @Router /api/agent/chat/stream [post]
 func (h *AgentHandler) ChatStream(c *gin.Context) {
 	var req ChatRequest
 	if err := c.ShouldBindJSON(&req); err != nil {
@@ -132,6 +158,13 @@ type TeamChatResponse struct {
 }
 
 // TeamChat 多智能体群聊
+// @Summary 多智能体群聊
+// @Tags 智能体管理
+// @Accept json
+// @Produce json
+// @Param request body TeamChatRequest true "群聊请求"
+// @Success 200 {object} TeamChatResponse
+// @Router /api/agent/team/chat [post]
 func (h *AgentHandler) TeamChat(c *gin.Context) {
 	var req TeamChatRequest
 	if err := c.ShouldBindJSON(&req); err != nil {
@@ -167,3 +200,46 @@ func (h *AgentHandler) TeamChat(c *gin.Context) {
 		Metadata:          nil,
 	})
 }
+
+// CreateAgent 创建智能体
+// @Summary 创建智能体
+// @Tags 智能体管理
+// @Accept json
+// @Produce json
+// @Param request body CreateAgentRequest true "创建智能体请求"
+// @Success 200 {object} CreateAgentResponse
+// @Router /api/agent/create [post]
+func (h *AgentHandler) CreateAgent(c *gin.Context) {
+	var req service.CreateAgentRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+
+	// 获取用户 ID
+	userID := 1 // TODO: 从 c.Get("user_id") 获取
+
+	result, err := h.agentService.CreateAgent(req, userID)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.JSON(http.StatusOK, result)
+}
+
+// ListAgents 获取智能体列表
+// @Summary 获取智能体列表
+// @Tags 智能体管理
+// @Produce json
+// @Success 200 {object} ListAgentsResponse
+// @Router /api/agent/list [get]
+func (h *AgentHandler) ListAgents(c *gin.Context) {
+	result, err := h.agentService.ListAgents()
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.JSON(http.StatusOK, result)
+}