feat(workflows): add workflows feature flag + Features-tab toggle

New opt-in 'workflows' master flag (default off) across the backend
KNOWN_FLAGS/DEFAULT_FLAGS and the frontend FeatureKey union, context
defaults, and a new Automation section card in the Features tab. Gates
the upcoming Workflows admin area and the engine runtime. en/de i18n
added (DE native).

backend/src/routes/adminFeatureFlags.js

@@ -88,6 +88,11 @@ const KNOWN_FLAGS = [
   // per-event-type presets and global watermark defaults tab. Strictly opt-in;
   // gates all slideshow admin UI (per-event card, type preset, settings tab).
   'slideshow',
+  // Workflow / automation engine — admin-configurable visual flows (triggers,
+  // conditions, branches, loops, approval gates). Strictly opt-in; master
+  // kill-switch for the Workflows admin area AND the engine's runtime side
+  // effects (no run is created/resumed while off).
+  'workflows',
 ];
 
 // Spec defaults for any flag missing from the DB (e.g. a row added by a
@@ -117,6 +122,7 @@ const DEFAULT_FLAGS = {
   projects: false,
   whatsapp: false,
   slideshow: false,
+  workflows: false,
 };
 
 async function readAllFlags() {

frontend/src/contexts/FeatureFlagsContext.tsx

@@ -64,6 +64,9 @@ export const DEFAULT_FLAGS: FeatureFlags = {
   whatsapp: false,
   // Live Slideshow ("Diashow") — opt-in; gates all slideshow admin UI.
   slideshow: false,
+  // Workflow / automation engine — opt-in; gates the Workflows admin area
+  // and the engine runtime (triggers/actions/gates).
+  workflows: false,
 };
 
 export const FEATURE_FLAGS_QUERY_KEY = ['feature-flags'] as const;

frontend/src/features/settings/tabs/FeaturesTab.tsx

@@ -23,6 +23,7 @@ import {
   Wallet,
   FolderKanban,
   MonitorPlay,
+  Workflow,
 } from 'lucide-react';
 import { useTranslation } from 'react-i18next';
 import { Button, Card } from '../../../components/common';
@@ -134,6 +135,24 @@ export const FeaturesTab: React.FC = () => {
           />
         </Section>
 
+        {/* Automation — the visual workflow engine. Master kill-switch for the
+            Workflows admin area and the runtime; off by default. */}
+        <Section title={t('settings.features.sections.automation', 'Automation')}>
+          <FeatureCard
+            icon={Workflow}
+            title={t('settings.features.workflows.title', 'Workflows')}
+            description={t(
+              'settings.features.workflows.description',
+              'Build visual automations on a canvas — triggers, conditions, branches, loops and admin approval gates. Your reminder ladder and booking steps become editable flows. Strictly opt-in.',
+            )}
+            status="new"
+            statusLabel={statusLabel('new')}
+            sidebarLabel={t('settings.features.workflows.sidebar', 'Workflows')}
+            enabled={staged.workflows}
+            onToggle={(next) => setFlag('workflows', next)}
+          />
+        </Section>
+
         {/* Clients (#354 follow-up). Visual grouping for the CRM-area
             sub-features. The "Clients" sidebar section itself is gated
             by a derived `clients` flag (computed from whether any

frontend/src/i18n/locales/de.json

@@ -1663,7 +1663,8 @@
         "accounting": "Buchhaltung",
         "insights": "Auswertungen & Zugriff",
         "customers": "Kunden",
-        "clients": "CRM"
+        "clients": "CRM",
+        "automation": "Automatisierung"
       },
       "status": {
         "stable": "stabil",
@@ -1779,6 +1780,11 @@
       "slideshow": {
         "title": "Live-Diashow",
         "description": "Ein separater Vollbild-„Diashow“-Link pro Event für Beamer bei Live-Events – übernimmt neue Uploads automatisch, mit Voreinstellungen je Event-Typ und globalen Wasserzeichen-Vorgaben unter Einstellungen → Diashow."
+      },
+      "workflows": {
+        "title": "Workflows",
+        "description": "Visuelle Automatisierungen auf einer Canvas erstellen – Auslöser, Bedingungen, Verzweigungen, Schleifen und Freigabe-Gates für Admins. Deine Mahnstufen und Buchungsschritte werden zu bearbeitbaren Abläufen. Strikt optional.",
+        "sidebar": "Workflows"
       }
     },
     "customerSurface": {

frontend/src/i18n/locales/en.json

@@ -1219,7 +1219,8 @@
         "accounting": "Accounting",
         "insights": "Insights & Access",
         "customers": "Customers",
-        "clients": "CRM"
+        "clients": "CRM",
+        "automation": "Automation"
       },
       "status": {
         "stable": "stable",
@@ -1335,6 +1336,11 @@
       "slideshow": {
         "title": "Live Slideshow",
         "description": "A separate fullscreen \"Diashow\" link per event for projectors at live events — auto-picks-up new uploads, with per-event-type presets and global watermark defaults under Settings → Slideshow."
+      },
+      "workflows": {
+        "title": "Workflows",
+        "description": "Build visual automations on a canvas — triggers, conditions, branches, loops and admin approval gates. Your reminder ladder and booking steps become editable flows. Strictly opt-in.",
+        "sidebar": "Workflows"
       }
     },
     "customerSurface": {

frontend/src/services/featureFlags.service.ts

@@ -66,7 +66,11 @@ export type FeatureKey =
   | 'whatsapp'
   // Live Slideshow ("Diashow") — per-event fullscreen kiosk link + presets +
   // global watermark settings tab. Strictly opt-in; gates all slideshow UI.
-  | 'slideshow';
+  | 'slideshow'
+  // Workflow / automation engine — admin-configurable visual flows (triggers,
+  // conditions, branches, loops, approval gates) built on a canvas. Strictly
+  // opt-in; gates the Workflows admin area and the engine runtime.
+  | 'workflows';
 
 export type FeatureFlags = Record<FeatureKey, boolean>;