Features:

- Node group CRUD operations with traffic-based filtering
  - Three grouping modes: average distribution, subscription-based, and traffic-based
  - Automatic and manual group recalculation with history tracking
  - Group assignment preview before applying changes
  - User subscription group locking to prevent automatic reassignment
  - Subscribe-to-group mapping configuration
  - Group calculation history and detailed reports
  - System configuration for group management (enabled/mode/auto_create)

  Database:
  - Add node_group table for group definitions
  - Add group_history and group_history_detail tables for tracking
  - Add node_group_ids (JSON) to nodes and subscribe tables
  - Add node_group_id and group_locked fields to user_subscribe table
  - Add migration files for schema changes

internal/logic/admin/group/createNodeGroupLogic.go

@@ -0,0 +1,46 @@
+package group
+
+import (
+	"context"
+	"time"
+
+	"github.com/perfect-panel/server/internal/model/group"
+	"github.com/perfect-panel/server/internal/svc"
+	"github.com/perfect-panel/server/internal/types"
+	"github.com/perfect-panel/server/pkg/logger"
+)
+
+type CreateNodeGroupLogic struct {
+	logger.Logger
+	ctx    context.Context
+	svcCtx *svc.ServiceContext
+}
+
+func NewCreateNodeGroupLogic(ctx context.Context, svcCtx *svc.ServiceContext) *CreateNodeGroupLogic {
+	return &CreateNodeGroupLogic{
+		Logger: logger.WithContext(ctx),
+		ctx:    ctx,
+		svcCtx: svcCtx,
+	}
+}
+
+func (l *CreateNodeGroupLogic) CreateNodeGroup(req *types.CreateNodeGroupRequest) error {
+	// 创建节点组
+	nodeGroup := &group.NodeGroup{
+		Name:           req.Name,
+		Description:    req.Description,
+		Sort:           req.Sort,
+		ForCalculation: req.ForCalculation,
+		MinTrafficGB:   req.MinTrafficGB,
+		MaxTrafficGB:   req.MaxTrafficGB,
+		CreatedAt:      time.Now(),
+		UpdatedAt:      time.Now(),
+	}
+	if err := l.svcCtx.DB.Create(nodeGroup).Error; err != nil {
+		logger.Errorf("failed to create node group: %v", err)
+		return err
+	}
+
+	logger.Infof("created node group: node_group_id=%d", nodeGroup.Id)
+	return nil
+}