refactor: Split subscriber service into separate files for better code organization

- Move IMSI allocation logic to subscriber_imsi.go
- Move authentication key generation (generateAuthKeys, getOperatorVariant, generateOPc) to subscriber_auth.go
- Move eSIM profile operations (provisionESIMProfile, deactivateESIMProfile) to subscriber_esim.go
- Keep core subscriber CRUD operations and session management in subscriber.go
- Remove unused crypto/aes, crypto/rand, encoding/hex, and os imports from main

apps/api-server/internal/services/subscriber_esim.go

@@ -0,0 +1,93 @@
+package services
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/nutcas3/telecom-platform/apps/api-server/internal/models"
+)
+
+// provisionESIMProfile provisions an eSIM profile for the subscriber
+func (s *SubscriberService) provisionESIMProfile(ctx context.Context, subscriberID uint) error {
+	// Get subscriber details
+	subscriber, err := s.db.GetSubscriber(ctx, subscriberID)
+	if err != nil {
+		return fmt.Errorf("failed to get subscriber: %w", err)
+	}
+
+	// Validate EID
+	if err := s.es2Service.ValidateEID(subscriber.EUICCID); err != nil {
+		return fmt.Errorf("invalid EID: %w", err)
+	}
+
+	// Provision profile via ES2+ API
+	profileInfo, err := s.es2Service.ProvisionProfile(ctx, subscriber)
+	if err != nil {
+		return fmt.Errorf("failed to provision profile: %w", err)
+	}
+
+	// Update subscriber with profile information
+	subscriber.ProfileID = profileInfo.ProfileID
+	subscriber.ProfileStatus = models.ProfileStatusDownloading
+
+	if err := s.db.UpdateSubscriber(ctx, subscriber); err != nil {
+		return fmt.Errorf("failed to update subscriber: %w", err)
+	}
+
+	// Activate profile
+	if err := s.es2Service.ActivateProfile(ctx, subscriber.EUICCID, profileInfo.ProfileID); err != nil {
+		return fmt.Errorf("failed to activate profile: %w", err)
+	}
+
+	// Update subscriber status
+	subscriber.ProfileStatus = models.ProfileStatusActive
+	if err := s.db.UpdateSubscriber(ctx, subscriber); err != nil {
+		return fmt.Errorf("failed to update subscriber status: %w", err)
+	}
+
+	// Notify AMF of new subscriber
+	if err := s.amfClient.NotifySubscriberUpdate(ctx, subscriber.IMSI, models.SubscriberStatusActive); err != nil {
+		fmt.Printf("Failed to notify AMF of subscriber activation: %v\n", err)
+	}
+
+	return nil
+}
+
+// deactivateESIMProfile deactivates an eSIM profile
+func (s *SubscriberService) deactivateESIMProfile(ctx context.Context, subscriberID uint) error {
+	// Get subscriber details
+	subscriber, err := s.db.GetSubscriber(ctx, subscriberID)
+	if err != nil {
+		return fmt.Errorf("failed to get subscriber: %w", err)
+	}
+
+	// Check if subscriber has active profile
+	if subscriber.ProfileID == "" || subscriber.ProfileStatus != models.ProfileStatusActive {
+		return fmt.Errorf("no active profile to deactivate")
+	}
+
+	// Deactivate profile via ES2+ API
+	if err := s.es2Service.DeactivateProfile(ctx, subscriber.EUICCID, subscriber.ProfileID); err != nil {
+		return fmt.Errorf("failed to deactivate profile: %w", err)
+	}
+
+	// Update subscriber status
+	subscriber.ProfileStatus = models.ProfileStatusInactive
+	subscriber.Status = models.SubscriberStatusInactive
+
+	if err := s.db.UpdateSubscriber(ctx, subscriber); err != nil {
+		return fmt.Errorf("failed to update subscriber: %w", err)
+	}
+
+	// Terminate all sessions
+	if err := s.terminateSubscriberSessions(ctx, subscriber.IMSI); err != nil {
+		fmt.Printf("Failed to terminate sessions: %v\n", err)
+	}
+
+	// Notify AMF of subscriber deactivation
+	if err := s.amfClient.NotifySubscriberUpdate(ctx, subscriber.IMSI, models.SubscriberStatusInactive); err != nil {
+		fmt.Printf("Failed to notify AMF of subscriber deactivation: %v\n", err)
+	}
+
+	return nil
+}