fix: record real admin identity in Users/Transactions audit trail

audit entries hardcoded actor: 'admin' regardless of who performed the
action. Both local gateways now pull the signed-in admin's displayName
from AdminAuthService, falling back to 'admin' only when unavailable.

Moderation's actor field is a role classifier ('admin' | 'customer'),
not an identity string, and is left unchanged.

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

src/app/features/admin/transactions/services/admin-transactions-local.gateway.ts

@@ -1,18 +1,24 @@
-import { Injectable } from '@angular/core';
+import { Injectable, inject } from '@angular/core';
 import { Observable, of } from 'rxjs';
 import { delay } from 'rxjs/operators';
 import { AdminTransaction, AdminTransactionListFilters, AdminTransactionsListResult } from '../models/admin-transaction.model';
 import { AdminTransactionsGateway } from './admin-transactions-gateway.interface';
 import { AdminOrdersLocalGateway } from '../../orders/services/admin-orders-local.gateway';
+import { AdminAuthService } from '../../../../core/admin-auth/admin-auth.service';
 
 const METHODS = ['card', 'qr', 'cash_on_delivery'];
 
 @Injectable({ providedIn: 'root' })
 export class AdminTransactionsLocalGateway implements AdminTransactionsGateway {
+  private readonly adminAuth = inject(AdminAuthService);
   private cache: AdminTransaction[] | null = null;
 
   constructor(private readonly ordersGateway: AdminOrdersLocalGateway) {}
 
+  private get currentActor(): string {
+    return this.adminAuth.displayName() ?? 'admin';
+  }
+
   loadTransactions(filters: AdminTransactionListFilters): Observable<AdminTransactionsListResult> {
     return new Observable<AdminTransactionsListResult>(subscriber => {
       this.ensureData().then(() => {
@@ -38,7 +44,7 @@ export class AdminTransactionsLocalGateway implements AdminTransactionsGateway {
       ...tx,
       status: 'retried',
       updatedAt: new Date().toISOString(),
-      audit: [...tx.audit, { action: 'Retried failed transaction', actor: 'admin', timestamp: new Date().toISOString() }],
+      audit: [...tx.audit, { action: 'Retried failed transaction', actor: this.currentActor, timestamp: new Date().toISOString() }],
     }));
   }
 
@@ -47,7 +53,7 @@ export class AdminTransactionsLocalGateway implements AdminTransactionsGateway {
       ...tx,
       fraudFlag: flagged,
       updatedAt: new Date().toISOString(),
-      audit: [...tx.audit, { action: flagged ? 'Flagged as fraud' : 'Fraud flag cleared', actor: 'admin', timestamp: new Date().toISOString() }],
+      audit: [...tx.audit, { action: flagged ? 'Flagged as fraud' : 'Fraud flag cleared', actor: this.currentActor, timestamp: new Date().toISOString() }],
     }));
   }
 

src/app/features/admin/users/services/admin-users-local.gateway.ts

@@ -1,8 +1,9 @@
-import { Injectable } from '@angular/core';
+import { Injectable, inject } from '@angular/core';
 import { Observable, of } from 'rxjs';
 import { delay } from 'rxjs/operators';
 import { AdminInvitation, AdminRole, AdminSession, AdminUser, AdminUserAuditEntry, AdminUserScope, AdminUserStatus } from '../models/admin-user.model';
 import { AdminUsersGateway } from './admin-users-gateway.interface';
+import { AdminAuthService } from '../../../../core/admin-auth/admin-auth.service';
 
 const BUILT_IN_ROLES: AdminRole[] = [
   { id: 'owner', name: 'Owner', permissions: ['*'], builtIn: true },
@@ -13,6 +14,7 @@ const BUILT_IN_ROLES: AdminRole[] = [
 
 @Injectable({ providedIn: 'root' })
 export class AdminUsersLocalGateway implements AdminUsersGateway {
+  private readonly adminAuth = inject(AdminAuthService);
   private users: AdminUser[] | null = null;
   private roles: AdminRole[] = [...BUILT_IN_ROLES];
   private invitations: AdminInvitation[] = [];
@@ -90,12 +92,16 @@ export class AdminUsersLocalGateway implements AdminUsersGateway {
     this.audit[userId] = [
       ...(this.audit[userId] ?? []),
       roleId
-        ? { eventKey: 'roleChanged', roleId, actor: 'admin', timestamp: new Date().toISOString() }
-        : { eventKey: 'statusChanged', status, actor: 'admin', timestamp: new Date().toISOString() },
+        ? { eventKey: 'roleChanged', roleId, actor: this.currentActor, timestamp: new Date().toISOString() }
+        : { eventKey: 'statusChanged', status, actor: this.currentActor, timestamp: new Date().toISOString() },
     ];
     return of(updated).pipe(delay(50));
   }
 
+  private get currentActor(): string {
+    return this.adminAuth.displayName() ?? 'admin';
+  }
+
   private ensureUsers(): AdminUser[] {
     if (!this.users) {
       this.users = [