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

internal/service/health_service.go

@@ -0,0 +1,18 @@
+package service
+
+import (
+	"epic-ent/internal/domain/vo"
+	"epic-ent/internal/repository"
+)
+
+type HealthService struct {
+	repo *repository.HealthRepository
+}
+
+func NewHealthService(repo *repository.HealthRepository) *HealthService {
+	return &HealthService{repo: repo}
+}
+
+func (s *HealthService) Check() vo.HealthStatus {
+	return s.repo.Check()
+}