feat: add local discount and adjustment calculations to financial models and transformers

- Introduced `discountAmountLocal` and `adjustmentLocal` properties across Bill, CreditNote, SaleInvoice, SaleReceipt, and VendorCredit models to calculate amounts in local currency.
- Updated transformers for CreditNote, PurchaseInvoice, and VendorCredit to include formatted representations of local discount and adjustment amounts.
- Enhanced GL entry services to handle discount and adjustment entries for SaleReceipt and CreditNote, ensuring accurate ledger entries.
- Improved overall consistency in handling financial calculations across various models and services.

packages/server/src/models/SaleReceipt.ts

@@ -53,6 +53,7 @@ export default class SaleReceipt extends mixin(TenantModel, [
       'adjustmentLocal',
 
       'discountAmount',
+      'discountAmountLocal',
       'discountPercentage',
 
       'paid',
@@ -97,14 +98,20 @@ export default class SaleReceipt extends mixin(TenantModel, [
       : this.subtotal * (this.discount / 100);
   }
 
+  /**
+   * Discount amount in local currency.
+   * @returns {number | null}
+   */
+  get discountAmountLocal() {
+    return this.discountAmount ? this.discountAmount * this.exchangeRate : null;
+  }
+
   /**
    * Discount percentage.
    * @returns {number | null}
    */
   get discountPercentage(): number | null {
-    return this.discountType === DiscountType.Percentage
-      ? this.discount
-      : null;
+    return this.discountType === DiscountType.Percentage ? this.discount : null;
   }
 
   /**