Initial phase 1 baseline implementation

internal/application/system.go

@@ -0,0 +1,41 @@
+package application
+
+import (
+	"context"
+	"fmt"
+)
+
+type SystemRepository interface {
+	DatabaseHealth(context.Context) error
+	OwnerExists(context.Context) (bool, error)
+}
+
+type SetupStatus struct {
+	Initialized bool   `json:"initialized"`
+	Phase       string `json:"phase"`
+	Version     string `json:"version"`
+}
+
+type SystemService struct {
+	repository SystemRepository
+	version    string
+}
+
+func NewSystemService(repository SystemRepository, version string) *SystemService {
+	return &SystemService{repository: repository, version: version}
+}
+
+func (s *SystemService) Readiness(ctx context.Context) error {
+	if err := s.repository.DatabaseHealth(ctx); err != nil {
+		return fmt.Errorf("database health: %w", err)
+	}
+	return nil
+}
+
+func (s *SystemService) SetupStatus(ctx context.Context) (SetupStatus, error) {
+	initialized, err := s.repository.OwnerExists(ctx)
+	if err != nil {
+		return SetupStatus{}, fmt.Errorf("read owner setup state: %w", err)
+	}
+	return SetupStatus{Initialized: initialized, Phase: "phase-1", Version: s.version}, nil
+}