fix: ADP portal payment uses client portion instead of full order total

When customers pay for ADP quotations through the portal, the system
was charging the full order amount (ADP + client portions combined).
Now correctly charges only the client portion (25% for REG clients).

Changes:
- Override _get_prepayment_required_amount() to return client portion
- Override _has_to_be_paid() to skip payment for 100% ADP-funded orders
- Add portal controller to cap payment amount at client portion
- Add portal template showing ADP funding breakdown to customer

fusion_claims/controllers/__init__.py

@@ -0,0 +1,2 @@
+# -*- coding: utf-8 -*-
+from . import portal

fusion_claims/controllers/portal.py

@@ -0,0 +1,54 @@
+# -*- coding: utf-8 -*-
+# Copyright 2024-2025 Nexa Systems Inc.
+# License OPL-1 (Odoo Proprietary License v1.0)
+# Part of the Fusion Claim Assistant product family.
+
+from odoo.addons.sale.controllers.portal import CustomerPortal
+
+
+class FusionCustomerPortal(CustomerPortal):
+
+    def _determine_is_down_payment(self, order_sudo, amount_selection, payment_amount):
+        """Override to use client portion for ADP down-payment comparison."""
+        if (
+            hasattr(order_sudo, '_is_adp_sale')
+            and order_sudo._is_adp_sale()
+            and order_sudo.x_fc_client_type == 'REG'
+        ):
+            payable = order_sudo.x_fc_client_portion_total or 0
+            if amount_selection == 'down_payment':
+                return True
+            elif amount_selection == 'full_amount':
+                return False
+            else:
+                return (
+                    order_sudo.prepayment_percent < 1.0 if payment_amount is None
+                    else payment_amount < payable
+                )
+        return super()._determine_is_down_payment(order_sudo, amount_selection, payment_amount)
+
+    def _get_payment_values(self, order_sudo, is_down_payment=False, payment_amount=None, **kwargs):
+        """Override to cap payment amount at client portion for ADP orders."""
+        values = super()._get_payment_values(
+            order_sudo,
+            is_down_payment=is_down_payment,
+            payment_amount=payment_amount,
+            **kwargs,
+        )
+
+        if not (
+            hasattr(order_sudo, '_is_adp_sale')
+            and order_sudo._is_adp_sale()
+            and order_sudo.x_fc_client_type == 'REG'
+        ):
+            return values
+
+        client_portion = order_sudo.x_fc_client_portion_total or 0
+        if client_portion <= 0:
+            return values
+
+        current_amount = values.get('amount', 0)
+        if current_amount > client_portion:
+            values['amount'] = order_sudo.currency_id.round(client_portion)
+
+        return values