feat(domains): Modul Domains mit AutoDNS-Zugang, Verbindungstest und Einstellungen

- Migration mit vier Tabellen (Einstellungen, Kunden, Kontaktzuordnung, Bestellungen), Zeilenschutz je Organisation
- AutoDNS-Client mit festen Demo-/Live-Adressen, Takt-Begrenzer, 20 s Zeitlimit, ohne Wiederholung
- Zugang je System verschluesselt gespeichert, Live-Wechsel nur mit Bestaetigung, Verbindungstest
- Modulseite mit Systemkennzeichnung und Reiter Einstellungen (nur Verwalten)

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

apps/web/src/messages/en.json

@@ -2048,5 +2048,65 @@
     "calendar": {
       "sourcesTitle": "Calendar sources"
     }
+  },
+  "domains": {
+    "title": "Domains",
+    "description": "Register domains with AutoDNS, assign contacts and customers",
+    "environment": {
+      "demo": "Demo system (test mode)",
+      "live": "Live system – registrations cost money",
+      "notConfigured": "AutoDNS not set up"
+    },
+    "tabs": {
+      "settings": "Settings"
+    },
+    "notConfigured": {
+      "title": "AutoDNS is not set up yet.",
+      "managerHint": "Enter the user name, password and context of the selected system in the settings.",
+      "goToSettings": "Go to settings",
+      "userHint": "Please ask an administrator or someone with the Manage permission level."
+    },
+    "settings": {
+      "loading": "Loading settings …",
+      "save": "Save",
+      "saving": "Saving …",
+      "saved": "Saved.",
+      "system": {
+        "title": "System",
+        "description": "Choose whether Tessera works with the AutoDNS test system or with the real AutoDNS system.",
+        "demo": "Demo system (test mode)",
+        "demoHelp": "For trying things out. No real registrations are made here.",
+        "live": "Live system (billable)",
+        "liveHelp": "Registrations are binding and cost money.",
+        "confirmText": "From now on, registrations run through the AutoDNS live system and cost money.",
+        "confirm": "Use live system",
+        "cancel": "Cancel"
+      },
+      "access": {
+        "demoTitle": "Demo system access",
+        "liveTitle": "Live system access",
+        "description": "You receive these details from AutoDNS. The password is stored encrypted and is never shown again.",
+        "user": "User name",
+        "password": "Password",
+        "passwordStored": "Stored – leave empty to keep it",
+        "context": "Context",
+        "contextHelp": "Use a dedicated AutoDNS user for Tessera without two-factor sign-in.",
+        "contextInvalid": "The context must be a whole number greater than 0.",
+        "test": "Test connection",
+        "testing": "Testing connection …",
+        "saveFirst": "Please save first"
+      },
+      "nameServers": {
+        "title": "Default name servers",
+        "description": "These name servers are prefilled for every registration. They must already be set up with your provider, otherwise the registration fails.",
+        "label": "Name server {number}",
+        "add": "Add name server",
+        "remove": "Remove"
+      }
+    },
+    "errors": {
+      "request": "The request failed. Please try again.",
+      "loadStatus": "The state of the AutoDNS connection could not be loaded."
+    }
   }
 }