hotfix: add missing currency_id fields to resolve ValidationError

- Add currency_id field to payment.details.lines model (PaymentDetailsLines class)
- Add currency_id field to refund.details.lines model (RefundDetailsLines class)
- Fix ValidationError: Field 'currency_id' does not exist in model 'payment.details.lines'
- Ensure all amount fields have corresponding currency_id in their models

This resolves the Odoo validation error that occurs when upgrading the module:
'الحقل "currency_id" غير موجود في النموذج "payment.details.lines"'

Critical fix for production deployment.

odex25_ensan/odex_takaful/models/takaful_sponorship_model.py

@@ -1747,6 +1747,8 @@ class RefundDetailsLines(models.TransientModel):
         related='sponsorship_id.sponsor_id'
     )
     refund_amount = fields.Float(string='Refund Amount')
+    currency_id = fields.Many2one('res.currency', string='Currency', 
+                                  default=lambda self: self.env.company.currency_id, readonly=True)
     refund_reason = fields.Many2one(
         'refund.reasons',
         string='Refund Reason',
@@ -1779,6 +1781,8 @@ class PaymentDetailsLines(models.Model):
 
     donation_amount = fields.Float(string='Donation Amount')
     remaining_amount = fields.Float(string='Remaining Amount')
+    currency_id = fields.Many2one('res.currency', string='Currency', 
+                                  default=lambda self: self.env.company.currency_id, readonly=True)
     donation_date = fields.Date(string='Donation Date',default=lambda self: fields.Date.today(), readonly=True)
     payment_date = fields.Datetime(string='Payment Date', default=fields.Datetime.now)
     note = fields.Char(string='Note')