ADD: added basic backend function plus a mockup for a cli interface

backend/cmd/cli/user/list.go

@@ -0,0 +1,32 @@
+// cmd/cli/user/list.go
+package user
+
+import (
+	"fmt"
+	"myapp/internal/db"
+	usersvc "myapp/internal/user"
+
+	"github.com/spf13/cobra"
+)
+
+var listCmd = &cobra.Command{
+	Use:   "list",
+	Short: "List users",
+	RunE: func(cmd *cobra.Command, args []string) error {
+		database, err := db.New(getDSN())
+		if err != nil {
+			return err
+		}
+
+		service := usersvc.NewService(database)
+		users, err := service.List()
+		if err != nil {
+			return err
+		}
+
+		for _, u := range users {
+			fmt.Printf("%d | %s | %s\n", u.ID, u.Email, u.Name)
+		}
+		return nil
+	},
+}