Fix backend test gates and department product access

services/nginx/app/tests/Unit/Invoicing/EconomicV2BookedDepartment75DistributionTest.php

@@ -26,7 +26,7 @@ if (!class_exists('FakeEconomicV2BookedDepartment75VersioningService')) {
             return $this->subscriptionVersions;
         }
 
-        public function resolveDiscountOverrideAt(int $customer_number, bool $is_category, string|int $object_id, string $timestamp): ?array
+        public function resolveDiscountOverrideAt(int $customer_number, bool $is_category, string|int $object_id, string $timestamp, ?int $department_id = null): ?array
         {
             return null;
         }

services/nginx/app/tests/Unit/Invoicing/EconomicV2DistributionServiceFallbackTest.php

@@ -27,7 +27,7 @@ if (!class_exists('FakeEconomicV2DistributionVersioningService')) {
             return $this->subscriptionVersions;
         }
 
-        public function resolveDiscountOverrideAt(int $customer_number, bool $is_category, string|int $object_id, string $timestamp): ?array
+        public function resolveDiscountOverrideAt(int $customer_number, bool $is_category, string|int $object_id, string $timestamp, ?int $department_id = null): ?array
         {
             return null;
         }
@@ -97,7 +97,7 @@ if (!class_exists('TestableEconomicV2DistributionService')) {
             return 100.0;
         }
 
-        protected function resolveDiscountForProduct(int $customer_number, int $product_id, string $timestamp): ?array
+        protected function resolveDiscountForProduct(int $customer_number, int $product_id, string $timestamp, ?int $department_id = null): ?array
         {
             return null;
         }

services/nginx/app/tests/Unit/Invoicing/EconomicV2DistributionServiceOrderOverrideTest.php

@@ -23,7 +23,7 @@ if (!class_exists('EconomicV2DistributionServiceOrderOverrideVersioningDouble'))
             return [];
         }
 
-        public function resolveDiscountOverrideAt(int $customer_number, bool $is_category, string|int $object_id, string $timestamp): ?array
+        public function resolveDiscountOverrideAt(int $customer_number, bool $is_category, string|int $object_id, string $timestamp, ?int $department_id = null): ?array
         {
             return null;
         }

services/nginx/app/tests/Unit/Invoicing/EconomicV2DistributionServiceProductFixedPriceTest.php

@@ -23,7 +23,7 @@ if (!class_exists('FakeEconomicV2ProductFixedPriceVersioningService')) {
             return [];
         }
 
-        public function resolveDiscountOverrideAt(int $customer_number, bool $is_category, string|int $object_id, string $timestamp): ?array
+        public function resolveDiscountOverrideAt(int $customer_number, bool $is_category, string|int $object_id, string $timestamp, ?int $department_id = null): ?array
         {
             if (!$is_category && (int)$object_id === 42) {
                 return [
@@ -99,6 +99,21 @@ if (!class_exists('TestableEconomicV2ProductFixedPriceDistributionService')) {
             return 1000.0;
         }
 
+        protected function resolveDiscountForProduct(int $customer_number, int $product_id, string $timestamp, ?int $department_id = null): ?array
+        {
+            if ($product_id !== 42) {
+                return null;
+            }
+
+            return [
+                'customer_number' => $customer_number,
+                'is_category' => 0,
+                'object_id' => '42',
+                'discount' => 10,
+                'fixed_price' => 350,
+            ];
+        }
+
         protected function isOrderEligible(array $order): bool
         {
             return true;

services/nginx/app/tests/Unit/Invoicing/EconomicV2VersioningServiceStructureTest.php

@@ -41,5 +41,5 @@ it('anchors historical resolution on order created_at timestamps in distribution
     expect($content)->not->toBeFalse();
     expect($content)->toContain('resolveFixedPricingVersionAt($customer_number, $created_at)');
     expect($content)->toContain('resolveVehicleSubscriptionVersionsAt($customer_number, $created_at)');
-    expect($content)->toContain('resolveDiscountForProduct($customer_number, $product_id, $created_at)');
+    expect($content)->toContain('resolveDiscountForProduct($customer_number, $product_id, $created_at, $department_id)');
 });