add initial application structure with configuration, logging, and health check endpoints

internal/infra/cron/cron.go

@@ -0,0 +1,39 @@
+package cron
+
+import (
+	"context"
+	"time"
+
+	"github.com/robfig/cron/v3"
+	"go.uber.org/fx"
+	"go.uber.org/zap"
+
+	"epic-ent/internal/config"
+)
+
+func RegisterJobs(lc fx.Lifecycle, cfg *config.Config, logger *zap.Logger) {
+	if !cfg.Cron.Enabled {
+		return
+	}
+
+	loc, err := time.LoadLocation(cfg.Cron.Timezone)
+	if err != nil {
+		logger.Warn("invalid timezone, fallback to Local", zap.Error(err))
+		loc = time.Local
+	}
+
+	c := cron.New(cron.WithLocation(loc))
+
+	lc.Append(fx.Hook{
+		OnStart: func(ctx context.Context) error {
+			c.Start()
+			logger.Info("cron started")
+			return nil
+		},
+		OnStop: func(ctx context.Context) error {
+			c.Stop()
+			logger.Info("cron stopped")
+			return nil
+		},
+	})
+}