通道的增删接口实现，数据表和目录结构调整

web/services/node.go

@@ -0,0 +1,18 @@
+package services
+
+import "platform/web/models"
+
+var Node = &nodeService{}
+
+type nodeService struct{}
+
+func (s *nodeService) Filter(userId int32, proto ChannelProtocol, count int, config ...NodeFilterConfig) ([]*models.Node, error) {
+
+	return make([]*models.Node, 0), nil
+}
+
+type NodeFilterConfig struct {
+	province string
+	city     string
+	provider string
+}