docs: document patched backend image + enterprise subscription patch

- CRACKED.md: target image is marker689/shuffle-backend-unchained:12082026
- docker-compose.yml: point backend at patched image (drop override file)
- shared.go: HandleCheckLicense also sets org.Subscriptions to an active
  Enterprise License so the UI shows 'Licensed' (was showing Unlicensed)
- gitignore shuffle-database runtime *.conf

Verified: backend image builds and runs with all limits lifted.

backend/go-app/shuffle-shared/shared.go

@@ -33504,6 +33504,26 @@ func HandleCheckLicense(ctx context.Context, org Org) Org {
 	setActive(&org.SyncFeatures.Branding, unlimited)
 	setActive(&org.SyncFeatures.AgentExecutions, unlimited)
 	setActive(&org.SyncFeatures.AgentTokens, unlimited)
+	org.Subscriptions = []PaymentSubscription{{
+		Active:      true,
+		Startdate:   time.Now().Unix(),
+		Enddate:     time.Now().AddDate(10, 0, 0).Unix(),
+		Name:        "Enterprise License",
+		SupportLevel: "Enterprise Support",
+		Recurrence:  "monthly",
+		Level:       "1",
+		Amount:      "0",
+		Currency:    "USD",
+		Limit:       1,
+		EulaSigned:  true,
+		Features: []string{
+			"∞ Days Workflow Run History",
+			"∞ Days Workflow Backup",
+			"∞ Users",
+			"Air Gap Environment",
+			"Critical Response",
+		},
+	}}
 	return org
 	// ===== END LICENSE BYPASS PATCH =====