feat: Add MVNO onboarding service with step-based workflow execution and progress tracking

- Add OnboardingService struct with validator, provisioner, and monitor dependencies
- Add StartOnboarding method with request validation, MVNO record creation, and async workflow execution
- Add executeOnboarding method with sequential step processing, context cancellation support, and progress updates
- Add executeStep method with switch-based routing for validation, provisioning, carrier setup, billing

apps/carrier-connector/internal/mvno/onboarding_service.go

@@ -0,0 +1,151 @@
+package mvno
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/nutcas3/telecom-platform/apps/carrier-connector/internal/id"
+	"github.com/sirupsen/logrus"
+)
+
+// OnboardingService handles MVNO onboarding process
+type OnboardingService struct {
+	logger      *logrus.Logger
+	validator   *OnboardingValidator
+	provisioner *MVNOProvisioner
+	monitor     *OnboardingMonitor
+}
+
+// NewOnboardingService creates a new onboarding service
+func NewOnboardingService(logger *logrus.Logger) *OnboardingService {
+	return &OnboardingService{
+		logger:      logger,
+		validator:   NewOnboardingValidator(logger),
+		provisioner: NewMVNOProvisioner(logger),
+		monitor:     NewOnboardingMonitor(logger),
+	}
+}
+
+// StartOnboarding initiates the MVNO onboarding process
+func (s *OnboardingService) StartOnboarding(ctx context.Context, req *OnboardingRequest) (*MVNO, error) {
+	// Validate the onboarding request
+	if err := s.validator.ValidateRequest(req); err != nil {
+		return nil, fmt.Errorf("validation failed: %w", err)
+	}
+
+	// Create MVNO record
+	mvno := &MVNO{
+		ID:         id.GeneratePrefixed("mvno"),
+		BusinessID: req.BusinessID,
+		Name:       req.BusinessName,
+		Status:     StatusPending,
+		Plan:       req.Plan,
+		Config: MVNOConfig{
+			MaxSubscribers:    s.getMaxSubscribersForPlan(req.Plan),
+			AllowedCountries:  req.TargetCountries,
+			CustomBranding:    req.Plan != PlanStarter,
+			APIAccess:         req.Plan != PlanStarter,
+			AdvancedAnalytics: req.Plan == PlanScale || req.Plan == PlanEnterprise,
+		},
+		CreatedAt: time.Now(),
+	}
+
+	// Start onboarding progress tracking
+	progress := &OnboardingProgress{
+		MVNOID:    mvno.ID,
+		Steps:     s.getOnboardingSteps(),
+		Progress:  0.0,
+		StartedAt: time.Now(),
+	}
+
+	s.logger.WithFields(logrus.Fields{
+		"mvno_id":     mvno.ID,
+		"business_id": req.BusinessID,
+		"plan":        req.Plan,
+	}).Info("Starting MVNO onboarding")
+
+	// Execute onboarding steps asynchronously
+	go s.executeOnboarding(ctx, mvno, progress)
+
+	return mvno, nil
+}
+
+// executeOnboarding runs all onboarding steps
+func (s *OnboardingService) executeOnboarding(ctx context.Context, mvno *MVNO, progress *OnboardingProgress) {
+	for i, step := range progress.Steps {
+		select {
+		case <-ctx.Done():
+			s.logger.WithField("mvno_id", mvno.ID).Error("Onboarding cancelled")
+			return
+		default:
+		}
+
+		step.Status = "running"
+		s.monitor.UpdateProgress(mvno.ID, progress)
+
+		if err := s.executeStep(ctx, mvno, &step); err != nil {
+			step.Status = "failed"
+			step.Error = err.Error()
+			s.logger.WithError(err).WithField("step", step.Name).Error("Step failed")
+			break
+		}
+
+		step.Status = "completed"
+		step.CompletedAt = time.Now()
+		progress.Progress = float64(i+1) / float64(len(progress.Steps)) * 100
+
+		s.monitor.UpdateProgress(mvno.ID, progress)
+	}
+
+	if progress.Progress == 100.0 {
+		mvno.Status = StatusActive
+		progress.CompletedAt = time.Now()
+		s.logger.WithField("mvno_id", mvno.ID).Info("Onboarding completed")
+	}
+}
+
+// executeStep executes a single onboarding step
+func (s *OnboardingService) executeStep(ctx context.Context, mvno *MVNO, step *OnboardingStep) error {
+	switch step.Name {
+	case "validation":
+		return s.validator.ValidateMVNO(ctx, mvno)
+	case "provisioning":
+		return s.provisioner.ProvisionResources(ctx, mvno)
+	case "carrier_setup":
+		return s.provisioner.SetupCarriers(ctx, mvno)
+	case "billing_setup":
+		return s.provisioner.SetupBilling(ctx, mvno)
+	case "api_access":
+		return s.provisioner.SetupAPIAccess(ctx, mvno)
+	default:
+		return fmt.Errorf("unknown step: %s", step.Name)
+	}
+}
+
+// getOnboardingSteps returns the standard onboarding workflow
+func (s *OnboardingService) getOnboardingSteps() []OnboardingStep {
+	return []OnboardingStep{
+		{Name: "validation", Status: "pending"},
+		{Name: "provisioning", Status: "pending"},
+		{Name: "carrier_setup", Status: "pending"},
+		{Name: "billing_setup", Status: "pending"},
+		{Name: "api_access", Status: "pending"},
+	}
+}
+
+// getMaxSubscribersForPlan returns subscriber limits per plan
+func (s *OnboardingService) getMaxSubscribersForPlan(plan MVNOPlan) int {
+	switch plan {
+	case PlanStarter:
+		return 1000
+	case PlanGrowth:
+		return 10000
+	case PlanScale:
+		return 100000
+	case PlanEnterprise:
+		return -1 // Unlimited
+	default:
+		return 1000
+	}
+}