feat(cashier+checker): add cashier deposit maker-checker flow and voucher system

- Add cashier deposit service and submit flow via maker-checker
- New CashierDepositService: submit, approve, reject, list endpoints
- Transaction-entry: cashier SD deposit goes to deposit-requests instead of direct credit
- Checker inbox: new Deposit Requests tab with approve/reject review dialog
- Cashier nav: My Deposit Requests tracking page
- Withdrawal requests: show voucher_no from backend instead of JS-padded id
- clerk-withdrawal.service: disburse denominationData accepts null for non-cash
- Role-based checker enforcement: only manager/head-cashier can approve/reject
- Maker cannot approve own request (self-approval blocked at backend)
- Denomination total validation: breakdown must match transaction amount

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

src/app/core/shell/shell.component.html

@@ -144,6 +144,13 @@
           >
             <fa-icon icon="keyboard"></fa-icon> Transaction Entry
           </a>
+          <a
+            class="cashier-nav__item"
+            [routerLink]="['/cashier/my-deposit-requests']"
+            routerLinkActive="cashier-nav__item--active"
+          >
+            <fa-icon icon="money-bill-wave"></fa-icon> My Deposits
+          </a>
           <a
             class="cashier-nav__item"
             [routerLink]="['/cashier/share-collection']"