feat(PROJ-50): Admin-Tab "DSGVO-Anfragen" implementiert

Neuer Tab im Admin-Bereich: Antrags-Liste, Formular (Adresse + Zeitraum),
Detail-Dialog mit Mail-Tabelle, PDF-Export und Löschen mit Bestätigung.
Rollen-Gating: admin/auditor sehen den Tab, nur admin kann anlegen/löschen.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/admin/page.tsx

@@ -35,11 +35,20 @@ import { RetentionTab } from "@/components/admin/tabs/RetentionTab";
 import { ArchivingRulesTab } from "@/components/admin/tabs/ArchivingRulesTab";
 import { QuotaTab } from "@/components/admin/tabs/QuotaTab";
 import { SMTPOutTab } from "@/components/admin/tabs/SMTPOutTab";
+import { DSGVOTab } from "@/components/admin/tabs/DSGVOTab";
 import { ResetPasswordDialog, DeleteUserDialog } from "@/components/admin/UserDialogs";
 
 export default function AdminPage() {
   const { user, loading: authLoading } = useAuth("domain_admin", "/admin/login");
   const isSuperAdmin = user?.role === "superadmin";
+  const canManageDSGVO =
+    user?.role === "superadmin" ||
+    user?.role === "domain_admin" ||
+    user?.role === "admin";
+  const canViewDSGVO =
+    canManageDSGVO ||
+    user?.role === "auditor" ||
+    user?.role === "domain_auditor";
 
   const dashboard = useAdminDashboard(!!user);
   const usersState = useAdminUsers();
@@ -144,6 +153,7 @@ export default function AdminPage() {
             {isSuperAdmin && <TabsTrigger value="services">Dienste</TabsTrigger>}
             <TabsTrigger value="users">Benutzer</TabsTrigger>
             <TabsTrigger value="audit">Audit-Log</TabsTrigger>
+            {canViewDSGVO && <TabsTrigger value="dsgvo">DSGVO-Anfragen</TabsTrigger>}
             <TabsTrigger value="import">Import</TabsTrigger>
             {isSuperAdmin && <TabsTrigger value="ldap" onClick={loadLDAP}>LDAP (Global)</TabsTrigger>}
             {!isSuperAdmin && user?.role === "domain_admin" && (
@@ -234,6 +244,12 @@ export default function AdminPage() {
             />
           </TabsContent>
 
+          {canViewDSGVO && (
+            <TabsContent value="dsgvo">
+              <DSGVOTab canManage={canManageDSGVO} />
+            </TabsContent>
+          )}
+
           <TabsContent value="import">
             <ImportTab
               uploadDragging={upload.uploadDragging}