feat: 编写swagger注释并生成文档

backend/handlers/search_handler.go

@@ -17,6 +17,14 @@ func NewSearchHandler(service services.GraphService) *SearchHandler {
 	}
 }
 
+// @Summary 搜索节点
+// @Description 根据关键词搜索知识图谱中的节点
+// @Produce json
+// @Param q query string true "搜索关键词"
+// @Success 200 {object} models.SearchResponse "成功"
+// @Failure 400 {object} models.ErrorResponse "请求错误"
+// @Failure 500 {object} models.ErrorResponse "内部错误"
+// @Router /api/search [get]
 func (h *SearchHandler) SearchNodes(c *gin.Context) {
 	query := c.Query("q")
 	if query == "" {