Rebrand from Casera/MyCrib to honeyDue

Total rebrand across all Go API source files:
- Go module path: casera-api -> honeydue-api
- All imports updated (130+ files)
- Docker: containers, images, networks renamed
- Email templates: support email, noreply, icon URL
- Domains: casera.app/mycrib.treytartt.com -> honeyDue.treytartt.com
- Bundle IDs: com.tt.casera -> com.tt.honeyDue
- IAP product IDs updated
- Landing page, admin panel, config defaults
- Seeds, CI workflows, Makefile, docs
- Database table names preserved (no migration needed)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

internal/services/subscription_service_test.go

@@ -7,9 +7,9 @@ import (
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 
-	"github.com/treytartt/casera-api/internal/models"
-	"github.com/treytartt/casera-api/internal/repositories"
-	"github.com/treytartt/casera-api/internal/testutil"
+	"github.com/treytartt/honeydue-api/internal/models"
+	"github.com/treytartt/honeydue-api/internal/repositories"
+	"github.com/treytartt/honeydue-api/internal/testutil"
 )
 
 // setupSubscriptionService creates a SubscriptionService with the given
@@ -140,7 +140,7 @@ func TestProcessGooglePurchase_ClientNil_ReturnsError(t *testing.T) {
 		googleClient:     nil, // Not configured
 	}
 
-	_, err := svc.ProcessGooglePurchase(user.ID, "fake-token", "com.tt.casera.pro.monthly")
+	_, err := svc.ProcessGooglePurchase(user.ID, "fake-token", "com.tt.honeyDue.pro.monthly")
 	assert.Error(t, err, "ProcessGooglePurchase should return error when Google IAP client is nil")
 
 	// Verify user was NOT upgraded to Pro