feat(cashbox): book a catalog penalty directly as a transaction

Adds a catalog picker to the member-booking form in the cashbox (prefills
amount/note/type, stays editable) and a "Buchen" button on each penalty
catalog entry that jumps to the cashbox with that entry preselected via a
penaltyId query param. No backend changes — reuses the existing POST
/transactions flow, the catalog only supplies starting values.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

myteamwallet_frontend_modern/src/app/features/team/cashbox/cashbox.html

@@ -20,6 +20,18 @@
       </mat-card-header>
       <mat-card-content>
         <form [formGroup]="playerForm" (ngSubmit)="submitPlayerBooking()">
+          @if (penalties().length > 0) {
+            <mat-form-field appearance="outline" class="wide">
+              <mat-label>Aus Strafenkatalog übernehmen (optional)</mat-label>
+              <mat-select (selectionChange)="onPenaltySelect($event.value)">
+                @for (penalty of penalties(); track penalty.id) {
+                  <mat-option [value]="penalty.id"
+                    >{{ penalty.description }} · {{ penalty.amount | currency: 'EUR' }}</mat-option
+                  >
+                }
+              </mat-select>
+            </mat-form-field>
+          }
           <mat-form-field appearance="outline" class="wide">
             <mat-label>Mitglieder</mat-label>
             <mat-select formControlName="playerIds" multiple>