feat(domains): Kunden, Kontakte aus AutoDNS mit Zuordnung und Domainliste

- Kunden mit Markierung eigene Firma, Kontakte live aus AutoDNS (seitenweise, 60 s Zwischenspeicher), Zuordnung je System
- Kontakt anlegen (Person/Organisation) und einem oder mehreren Kunden zuordnen, nur mit Verwalten
- Domainliste mit Kunde (ueber den Inhaber-Kontakt), Inhaber, Ablaufdatum, Status; Filter und Gruppierung nach Kunde
- Mandantenschutz-Inventar um die beiden neuen Zugriffspaare ergaenzt

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

apps/web/src/messages/en.json

@@ -2058,6 +2058,9 @@
       "notConfigured": "AutoDNS not set up"
     },
     "tabs": {
+      "domains": "Domains",
+      "contacts": "Contacts",
+      "customers": "Customers",
       "settings": "Settings"
     },
     "notConfigured": {
@@ -2104,6 +2107,105 @@
         "remove": "Remove"
       }
     },
+    "common": {
+      "customerFilter": "Customer",
+      "allCustomers": "All customers",
+      "unassigned": "Unassigned",
+      "groupByCustomer": "Group by customer",
+      "loading": "Loading …",
+      "truncated": "Only the first 2000 entries are shown.",
+      "requestFailed": "The request failed. Please try again."
+    },
+    "domainList": {
+      "search": "Search domains",
+      "refresh": "Reload from AutoDNS",
+      "empty": "No domains were found at AutoDNS.",
+      "emptyFiltered": "No domain matches your selection.",
+      "unassigned": "Unassigned",
+      "cancelPending": "Cancellation pending",
+      "groupCount": "{count, plural, one {# domain} other {# domains}}",
+      "columns": {
+        "domain": "Domain",
+        "customer": "Customer",
+        "owner": "Owner",
+        "expires": "Expiry date",
+        "status": "Status"
+      },
+      "status": {
+        "ACTIVE": "Active",
+        "PENDING": "In progress",
+        "HOLD": "On hold (registry)",
+        "LOCK": "Locked"
+      }
+    },
+    "contactList": {
+      "intro": "All contacts that exist at AutoDNS in the selected system appear here. Assign them to a customer so that domains show up under the right customer.",
+      "search": "Search contacts",
+      "refresh": "Re-read from AutoDNS",
+      "newContact": "New contact",
+      "empty": "No contacts were found at AutoDNS.",
+      "emptyFiltered": "No contact matches your selection.",
+      "groupCount": "{count, plural, one {# contact} other {# contacts}}",
+      "columns": {
+        "name": "Name",
+        "organization": "Organisation",
+        "city": "City",
+        "email": "E-mail",
+        "customer": "Customer"
+      },
+      "selectContact": "Select contact {name}",
+      "selectAllVisible": "Select all shown",
+      "selectedCount": "{count, plural, =0 {Nothing selected} other {# selected}}",
+      "assignLabel": "Assign selected to",
+      "assignPlaceholder": "Choose customer …",
+      "removeAssignment": "Remove assignment",
+      "assign": "Assign",
+      "assigned": "The assignment was saved.",
+      "created": "The contact was created at AutoDNS."
+    },
+    "contactForm": {
+      "title": "New contact",
+      "type": "Type",
+      "person": "Person",
+      "org": "Company or organisation",
+      "organization": "Organisation",
+      "fname": "First name",
+      "lname": "Last name",
+      "street": "Street and house number",
+      "street2": "Second address line (optional)",
+      "pcode": "Postal code",
+      "city": "City",
+      "country": "Country",
+      "phone": "Phone",
+      "phoneHint": "International format, e.g. +49 30 123456",
+      "email": "E-mail",
+      "customer": "Customer (optional)",
+      "noCustomer": "No customer",
+      "save": "Save",
+      "saving": "Saving …",
+      "cancel": "Cancel",
+      "errors": {
+        "required": "Please fill in this field.",
+        "email": "Please enter a valid e-mail address.",
+        "phone": "Please use the international format, e.g. +49 30 123456."
+      }
+    },
+    "customers": {
+      "intro": "Customers group AutoDNS contacts. A domain appears under the customer of its owner. Add your own company as a customer too and mark it.",
+      "addTitle": "Add customer",
+      "name": "Name",
+      "ownCompanyLabel": "This is our own company",
+      "ownCompany": "Own company",
+      "add": "Add customer",
+      "empty": "No customers have been added yet.",
+      "contactCount": "{count, plural, =0 {No contacts} one {# contact} other {# contacts}}",
+      "edit": "Edit",
+      "save": "Save",
+      "cancel": "Cancel",
+      "delete": "Delete",
+      "confirmDelete": "Really delete customer “{name}”?",
+      "confirmDeleteYes": "Delete permanently"
+    },
     "errors": {
       "request": "The request failed. Please try again.",
       "loadStatus": "The state of the AutoDNS connection could not be loaded."