feat(templates): UI fuer Berechtigungs-Vorlagen — Modul 6/16 des UI-Backlogs

Backend existierte vollstaendig (list mit entity_type-Filter, create, update,
delete, apply — templates:read/write, seit Audit-Fix im Katalog), Frontend
hatte 0% Abdeckung.

- api/permissionTemplates.ts: TanStack-Hooks (usePermissionTemplates,
  create/update/delete/apply mit Cache-Invalidierung, TemplateLevel-Typ)
- pages/PermissionTemplates.tsx: Template-Karten (Name, Level-Badge,
  Entity-Type, Auto-Share-Zusammenfassung), Create/Edit-Dialog mit
  Level-Select und JSON-Textarea inkl. Array-Validierung mit Fehlertext,
  Apply-Dialog (Entity-Type vorbelegt, Entity-ID), Ergebnis-Banner mit
  Anzahl erstellter Berechtigungen, Delete mit Confirm — alle Aktionen
  hinter templates:write gegated
- Platzierung: Settings-Subpage /settings/permission-templates (statisch,
  Core-Route) + Settings-Nav-Item
- i18n permissionTemplates.* de/en

Verifikation: Vitest 10/10 (Rendering, Level-Badges, Create mit validem +
invalidem JSON, Edit prefilled, Apply mit Ergebnis, Delete-Confirm,
Permission-Gating, Empty/Error) · tsc exit 0 · production build exit 0.

frontend/src/i18n/locales/de.json

@@ -1723,5 +1723,40 @@
     "empty": "Keine Plugins gefunden.",
     "loadError": "Marketplace konnte nicht geladen werden.",
     "noAccess": "Kein Zugriff auf den Marketplace (marketplace:read noetig)."
+  },
+  "permissionTemplates": {
+    "title": "Berechtigungs-Vorlagen",
+    "create": "Vorlage erstellen",
+    "createTitle": "Neue Berechtigungs-Vorlage",
+    "createSubmit": "Erstellen",
+    "editTitle": "Vorlage bearbeiten",
+    "save": "Speichern",
+    "name": "Name",
+    "namePlaceholder": "z.B. Standard-Freigabe Kontakte",
+    "entityType": "Entitaets-Typ",
+    "entityTypePlaceholder": "z.B. contact",
+    "entityId": "Entitaets-ID",
+    "level": "Standard-Level",
+    "levelRead": "Lesen",
+    "levelWrite": "Schreiben",
+    "levelAdmin": "Admin",
+    "levelDelete": "Loeschen",
+    "level_read": "Lesen",
+    "level_write": "Schreiben",
+    "level_admin": "Admin",
+    "level_delete": "Loeschen",
+    "autoShareWith": "Automatisch teilen mit",
+    "autoShareJson": "Freigaben (JSON)",
+    "autoShareHelper": "Liste von {principal_type, principal_id, level}. Leer = keine Auto-Freigaben.",
+    "jsonInvalid": "Ungueltiges JSON",
+    "jsonMustBeArray": "Das JSON muss eine Liste sein",
+    "apply": "Anwenden",
+    "applyTitle": "Vorlage '{{name}}' anwenden",
+    "applySubmit": "Anwenden",
+    "appliedCount": "{{count}} Berechtigung(en) erstellt",
+    "delete": "Loeschen",
+    "deleteConfirm": "Vorlage '{{name}}' wirklich loeschen?",
+    "empty": "Keine Berechtigungs-Vorlagen vorhanden.",
+    "loadError": "Vorlagen konnten nicht geladen werden."
   }
 }

frontend/src/i18n/locales/en.json

@@ -1723,5 +1723,40 @@
     "empty": "No plugins found.",
     "loadError": "Failed to load the marketplace.",
     "noAccess": "No marketplace access (marketplace:read required)."
+  },
+  "permissionTemplates": {
+    "title": "Permission Templates",
+    "create": "Create template",
+    "createTitle": "New permission template",
+    "createSubmit": "Create",
+    "editTitle": "Edit template",
+    "save": "Save",
+    "name": "Name",
+    "namePlaceholder": "e.g. Standard contact sharing",
+    "entityType": "Entity type",
+    "entityTypePlaceholder": "e.g. contact",
+    "entityId": "Entity ID",
+    "level": "Default level",
+    "levelRead": "Read",
+    "levelWrite": "Write",
+    "levelAdmin": "Admin",
+    "levelDelete": "Delete",
+    "level_read": "Read",
+    "level_write": "Write",
+    "level_admin": "Admin",
+    "level_delete": "Delete",
+    "autoShareWith": "Auto-share with",
+    "autoShareJson": "Share entries (JSON)",
+    "autoShareHelper": "List of {principal_type, principal_id, level}. Empty = no auto-shares.",
+    "jsonInvalid": "Invalid JSON",
+    "jsonMustBeArray": "The JSON must be an array",
+    "apply": "Apply",
+    "applyTitle": "Apply template '{{name}}'",
+    "applySubmit": "Apply",
+    "appliedCount": "{{count}} permission(s) created",
+    "delete": "Delete",
+    "deleteConfirm": "Really delete template '{{name}}'?",
+    "empty": "No permission templates yet.",
+    "loadError": "Failed to load templates."
   }
 }