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/handler/admin/group/createNodeGroupHandler.go

@@ -0,0 +1,26 @@
+package group
+
+import (
+	"github.com/gin-gonic/gin"
+	"github.com/perfect-panel/server/internal/logic/admin/group"
+	"github.com/perfect-panel/server/internal/svc"
+	"github.com/perfect-panel/server/internal/types"
+	"github.com/perfect-panel/server/pkg/result"
+)
+
+// Create node group
+func CreateNodeGroupHandler(svcCtx *svc.ServiceContext) func(c *gin.Context) {
+	return func(c *gin.Context) {
+		var req types.CreateNodeGroupRequest
+		_ = c.ShouldBind(&req)
+		validateErr := svcCtx.Validate(&req)
+		if validateErr != nil {
+			result.ParamErrorResult(c, validateErr)
+			return
+		}
+
+		l := group.NewCreateNodeGroupLogic(c.Request.Context(), svcCtx)
+		err := l.CreateNodeGroup(&req)
+		result.HttpResult(c, nil, err)
+	}
+}