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/cashier/clerk-withdrawal.service.ts

@@ -54,7 +54,7 @@ export class ClerkWithdrawalService {
     return this.http.get(`/clerk/withdrawal-requests/by-token/${encodeURIComponent(token)}`);
   }
 
-  disburse(id: number, denominationData: string, transactionAmount?: number): Observable<any> {
+  disburse(id: number, denominationData: string | null, transactionAmount?: number): Observable<any> {
     return this.http.post(`/clerk/withdrawal-requests/${id}/disburse`, {
       denominationData,
       transactionAmount: transactionAmount != null ? String(transactionAmount) : null