add basic scheduler

internal/app/app.go

@@ -2,6 +2,8 @@ package app
 
 import (
 	"log/slog"
+
+	"git.front.kjuulh.io/kjuulh/orbis/internal/scheduler"
 )
 
 type App struct {
@@ -17,3 +19,7 @@ func NewApp() *App {
 func (a *App) Logger() *slog.Logger {
 	return a.logger
 }
+
+func (a *App) Scheduler() *scheduler.Scheduler {
+	return scheduler.NewScheduler(a.logger)
+}