Pick candidate resources by whether they actually offer the service

findEligible matched on address, type and skills, so two devices of the same
type were interchangeable even when only one of them performed the service.
It now also consults the offering table.

The filter is conditional on purpose: it only applies once the clinic has
registered at least one resource for that service. Applying it unconditionally
would leave every environment that has not filled the links in yet without a
single free slot overnight — a silent outage caused by a feature they never
opted into. When rows do exist but all are inactive the result is empty, which
is the honest answer: nobody performs this right now.

The service comes from the segment template rather than the root service. One
appointment's plan can carry segments from several items, and "who can do this"
is a per-item question.

Five tests: the filter picking one of two identical devices, the no-rows
passthrough, the all-inactive empty, the no-service-argument path still
untouched, and the filter stacking with the skill filter.

Suite 1277 green — including the 27 existing plan and availability tests, which
is what proves the backward-compatible path.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/Appointment/Plan/Service/AppointmentPlanBuilder.php

@@ -222,10 +222,6 @@ final class AppointmentPlanBuilder
         return $counts;
     }
 
-    /**
-     * قانونی که نقشِ ناشناخته یا بی‌منبع می‌خواهد **خطاست، نه بی‌اثر**: در سکوت رد
-     * کردنش یعنی کلینیک فکر کند قانونش اجرا می‌شود در حالی که هیچ‌وقت نشده.
-     */
     /** @return list<PlannedRequirement> */
     private function planRequirements(
         SegmentTemplate $template,
@@ -278,7 +274,15 @@ final class AppointmentPlanBuilder
         SegmentTemplate $template,
     ): array {
         $skillIds = $requirement->getSkill() === null ? [] : [(int) $requirement->getSkill()->getId()];
-        $eligible = $this->resources->findEligible($address, $requirement->getResourceType(), $skillIds);
+
+        // سرویس از خودِ الگو می‌آید نه از سرویس ریشه: برنامهٔ یک نوبت می‌تواند بخش‌هایی
+        // از چند آیتم داشته باشد، و «کدام منبع این را می‌دهد» برای هر آیتم جداست.
+        $eligible = $this->resources->findEligible(
+            $address,
+            $requirement->getResourceType(),
+            $skillIds,
+            $template->getService(),
+        );
 
         if (!$requirement->requiresSameGender()) {
             return array_values($eligible);