fix(payment-received): allow decimal amounts in paymentAmount validation

Change @IsInt() to @IsNumber() for paymentAmount field in PaymentReceivedEntryDto
to allow recording payments with cents (e.g., $1,679.80).

Fixes #1016

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

packages/server/src/modules/PaymentReceived/dtos/PaymentReceived.dto.ts

@@ -35,7 +35,7 @@ export class PaymentReceivedEntryDto {
   invoiceId: number;
 
   @ToNumber()
-  @IsInt()
+  @IsNumber()
   @IsNotEmpty()
   paymentAmount: number;
 }