Referrals: 4 neue Beziehungen + Bearbeiten-Stift pro Eintrag

Beziehungs-Dropdown erweitert um Schwiegertochter/Schwiegersohn,
Schwiegermutter/Schwiegervater, Oma/Opa, Uroma/Uropa (Whitelist
front- und backend synchron).

Bearbeiten-Stift pro Zeile (vor der Muelltonne): Beziehung und/oder
Gegen-Kunde aenderbar. Neuer PUT /:customerId/referrals/:referralId
mit Whitelist-Pruefung, Doppel-Werber-409 (Self-Ausschluss),
Portal-Block und UPDATE-Auditeintrag.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend/src/components/customers/ReferralsTab.tsx

@@ -1,7 +1,7 @@
 import { useState } from 'react';
 import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
 import { Link } from 'react-router-dom';
-import { Plus, Search, Trash2, ExternalLink, X, Check } from 'lucide-react';
+import { Plus, Search, Trash2, ExternalLink, X, Check, Pencil } from 'lucide-react';
 import toast from 'react-hot-toast';
 import { referralApi } from '../../services/api';
 import { REFERRAL_RELATIONSHIPS } from '../../types';
@@ -177,24 +177,99 @@ function DraftRow({
   );
 }
 
-// Eine gespeicherte Zeile: Kunde (Link) + Beziehung + löschen + Externtab.
+// Eine gespeicherte Zeile: Kunde (Link) + Beziehung + bearbeiten/löschen + Externtab.
 function SavedRow({
   customerId,
   entry,
+  direction,
   canEdit,
-  onDeleted,
+  onChanged,
 }: {
   customerId: number;
   entry: ReferralEntry;
+  direction: 'recruitedBy' | 'recruited';
   canEdit: boolean;
-  onDeleted: () => void;
+  onChanged: () => void;
 }) {
+  const [editing, setEditing] = useState(false);
+  // Im Bearbeiten-Modus veränderbar: Gegen-Kunde und Beziehung.
+  const [selected, setSelected] = useState<CustomerSummary>(entry.customer);
+  const [relationship, setRelationship] = useState(entry.relationship);
+  const [showSearch, setShowSearch] = useState(false);
+
+  const startEdit = () => {
+    setSelected(entry.customer);
+    setRelationship(entry.relationship);
+    setEditing(true);
+  };
+
   const deleteMutation = useMutation({
     mutationFn: () => referralApi.remove(customerId, entry.id),
-    onSuccess: () => onDeleted(),
+    onSuccess: () => onChanged(),
     onError: (err: Error) => toast.error(err.message || 'Löschen fehlgeschlagen'),
   });
 
+  const saveMutation = useMutation({
+    mutationFn: () =>
+      referralApi.update(customerId, entry.id, {
+        direction,
+        otherCustomerId: selected.id,
+        relationship,
+      }),
+    onSuccess: () => {
+      setEditing(false);
+      onChanged();
+    },
+    onError: (err: Error) => toast.error(err.message || 'Speichern fehlgeschlagen'),
+  });
+
+  if (editing) {
+    return (
+      <div className="flex items-center gap-2 py-2 border-b bg-amber-50/50 px-2 rounded">
+        <div className="flex-1 flex items-center gap-2">
+          <span className="text-sm font-medium">{customerLabel(selected)}</span>
+          <button
+            onClick={() => setShowSearch(true)}
+            className="text-gray-400 hover:text-blue-600 p-1 rounded"
+            title="Anderen Kunden wählen"
+          >
+            <Search className="w-4 h-4" />
+          </button>
+        </div>
+        <div className="w-56">
+          <Select
+            value={relationship}
+            onChange={(e) => setRelationship(e.target.value)}
+            options={REFERRAL_RELATIONSHIPS.map((r) => ({ value: r, label: r }))}
+            placeholder="Bitte auswählen!"
+          />
+        </div>
+        <button
+          onClick={() => saveMutation.mutate()}
+          disabled={!relationship || saveMutation.isPending}
+          className="text-green-600 hover:text-green-700 disabled:text-gray-300 p-1 rounded"
+          title="Speichern"
+        >
+          <Check className="w-5 h-5" />
+        </button>
+        <button
+          onClick={() => setEditing(false)}
+          className="text-gray-400 hover:text-red-600 p-1 rounded"
+          title="Abbrechen"
+        >
+          <X className="w-5 h-5" />
+        </button>
+
+        <CustomerSearchModal
+          customerId={customerId}
+          isOpen={showSearch}
+          onClose={() => setShowSearch(false)}
+          onSelect={(c) => setSelected(c)}
+        />
+      </div>
+    );
+  }
+
   return (
     <div className="flex items-center gap-2 py-2 border-b px-2">
       <div className="flex-1 flex items-center gap-2">
@@ -218,14 +293,23 @@ function SavedRow({
       </div>
       <div className="w-56 text-sm">{entry.relationship}</div>
       {canEdit ? (
-        <button
-          onClick={() => deleteMutation.mutate()}
-          disabled={deleteMutation.isPending}
-          className="text-gray-400 hover:text-red-600 p-1 rounded"
-          title="Eintrag entfernen"
-        >
-          <Trash2 className="w-4 h-4" />
-        </button>
+        <>
+          <button
+            onClick={startEdit}
+            className="text-gray-400 hover:text-blue-600 p-1 rounded"
+            title="Eintrag bearbeiten"
+          >
+            <Pencil className="w-4 h-4" />
+          </button>
+          <button
+            onClick={() => deleteMutation.mutate()}
+            disabled={deleteMutation.isPending}
+            className="text-gray-400 hover:text-red-600 p-1 rounded"
+            title="Eintrag entfernen"
+          >
+            <Trash2 className="w-4 h-4" />
+          </button>
+        </>
       ) : (
         <span className="w-6" />
       )}
@@ -271,7 +355,7 @@ export default function ReferralsTab({ customerId, customerName, canEdit }: Refe
         </h3>
         {recruitedBy || addingRecruitedBy ? columnHeader : null}
         {recruitedBy ? (
-          <SavedRow customerId={customerId} entry={recruitedBy} canEdit={canEdit} onDeleted={refresh} />
+          <SavedRow customerId={customerId} entry={recruitedBy} direction="recruitedBy" canEdit={canEdit} onChanged={refresh} />
         ) : addingRecruitedBy ? (
           <DraftRow
             customerId={customerId}
@@ -303,7 +387,7 @@ export default function ReferralsTab({ customerId, customerName, canEdit }: Refe
         </h3>
         {recruited.length > 0 || addingRecruited ? columnHeader : null}
         {recruited.map((entry) => (
-          <SavedRow key={entry.id} customerId={customerId} entry={entry} canEdit={canEdit} onDeleted={refresh} />
+          <SavedRow key={entry.id} customerId={customerId} entry={entry} direction="recruited" canEdit={canEdit} onChanged={refresh} />
         ))}
         {addingRecruited && (
           <DraftRow