fix(models): remove timestamps from models where tables lack createdAt/updatedAt columns

Add withDateSessionMixin for proper timestamp handling and fix models
to return empty timestamps array when database tables don't have
created_at/updated_at columns. This prevents ORM insert/update errors.

Models updated:
- Branch, Role, RolePermission, ViewColumn, ViewRole
- InventoryAdjustment, InventoryAdjustmentEntry, InventoryTransactionMeta
- BillLandedCostEntry, CreditNote, CreditNoteAppliedInvoice, RefundCreditNote
- PaymentReceived, SaleInvoice, SaleReceipt, Item, ItemEntry
- RefundVendorCredit, VendorCreditAppliedBill
- ItemWarehouseQuantity, Warehouse, WarehouseTransfer, WarehouseTransferEntry
- Setting, TenantMetadataModel, TenantUser

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

packages/server/src/modules/SaleInvoices/models/SaleInvoice.ts

@@ -74,7 +74,7 @@ export class SaleInvoice extends TenantBaseModel {
    * Timestamps columns.
    */
   get timestamps() {
-    return ['created_at', 'updated_at'];
+    return ['createdAt', 'updatedAt'];
   }
 
   /**