feat(260519-0oz-01): add QboPaymentCreatePayload, QboDepositCreatePayload types and createPayment/createDeposit methods to QboClient

- Add QboPaymentCreatePayload + QboDepositCreatePayload interfaces to lib/types/qbo.ts
- Add createPayment(payload) and createDeposit(payload) public methods to QboClient
- Both methods use existing private this.request<T>() with POST + minorversion=65
- Both methods throw descriptively if QBO returns no Id in response

lib/types/qbo.ts

@@ -87,6 +87,37 @@ export interface QboDeposit {
   MetaData?: QboMetaData;
 }
 
+// Payload for creating a Payment via POST /v3/company/{realmId}/payment
+// Only the fields we actually send — QBO accepts many more but we keep the
+// surface area small and explicit.
+export interface QboPaymentCreatePayload {
+  CustomerRef: QboRef;                // { value: customer_ref_id }
+  TotalAmt: number;
+  TxnDate?: string;                   // YYYY-MM-DD
+  DepositToAccountRef?: QboRef;       // { value: account id }
+  PaymentRefNum?: string;             // check number (max 21 chars per QBO)
+  PrivateNote?: string;
+  Line?: Array<{
+    Amount: number;
+    LinkedTxn?: QboLinkedTxn[];       // one entry per invoice being paid
+  }>;
+}
+
+// Payload for creating a Deposit via POST /v3/company/{realmId}/deposit
+// Each Line links to a previously-created Payment so QBO groups them as a
+// single bank deposit (matches the bank slip).
+export interface QboDepositCreatePayload {
+  TxnDate?: string;
+  DepositToAccountRef: QboRef;        // required for deposit
+  PrivateNote?: string;
+  Line: Array<{
+    Amount: number;
+    DetailType: 'DepositLineDetail';
+    LinkedTxn?: QboLinkedTxn[];       // [{ TxnId: payment_id, TxnType: 'Payment' }]
+    DepositLineDetail?: Record<string, unknown>;
+  }>;
+}
+
 // Purchase (expense/credit card)
 export interface QboPurchase {
   Id: string;
@@ -156,6 +187,7 @@ export interface QboEntitySyncResult {
   entity: string;
   success: boolean;
   recordsUpserted: number;
+  recordsDeleted?: number;
   duration: number;
   error?: string;
 }