feat(treatment): select treatment behaviour by practice domain, not by if-branch

Everything that differs between specialties as data is already stored as data.
What is left is behaviour — when a case opens, what happens once a session ends —
so it becomes a TreatmentWorkflow resolved through a tagged-service registry.
The booking path calls one collaborator and never names a specialty; adding
dentistry is a new class, not an edit to confirmation.

A clinic that has chosen no practice domain still gets working multi-session
courses: DefaultTreatmentWorkflow answers for null and for any code without a
dedicated implementation, keeping "unset means behave as today, not error".
LaserTreatmentWorkflow is deliberately empty beyond claiming `beauty` — it is the
seam where laser-specific behaviour will land without disturbing anyone else.

Session due dates are anchored to the previous session's actual finish, so a
patient who comes twenty days late shifts the rest of their course instead of
getting the next session while it can still do nothing. Only the next session is
recomputed; later ones keep their estimate because they are anchored to nothing
yet.

Attachment targets the first session without an appointment rather than the
first open one: a patient booking again mid-course was otherwise matched to the
session that already had a booking, and the second appointment went nowhere.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

src/Treatment/Workflow/DefaultTreatmentWorkflow.php

@@ -0,0 +1,97 @@
+<?php
+
+namespace App\Treatment\Workflow;
+
+use App\Appointment\Entity\Appointment;
+use App\ClinicService\Entity\ServiceItem;
+use App\Patient\Entity\PatientRecord;
+use App\Treatment\Entity\TreatmentCase;
+use App\Treatment\Entity\TreatmentProtocol;
+use App\Treatment\Entity\TreatmentSession;
+use App\Treatment\Repository\TreatmentCaseRepository;
+use App\Treatment\Repository\TreatmentSessionRepository;
+use App\Treatment\Service\TreatmentCaseOpener;
+use App\Treatment\Service\TreatmentScheduler;
+use Doctrine\ORM\EntityManagerInterface;
+
+/**
+ * رفتار دورهٔ درمان وقتی حوزهٔ فعالیت پیاده‌سازی اختصاصی ندارد.
+ *
+ * عمداً پایین‌ترین اولویت را دارد و به هر کدی جواب مثبت می‌دهد، پس محیطی که هنوز
+ * حوزه‌اش را انتخاب نکرده هم دورهٔ چندجلسه‌ای‌اش کار می‌کند — تصمیمِ «نال یعنی رفتار
+ * امروز، نه خطا».
+ */
+class DefaultTreatmentWorkflow implements TreatmentWorkflow
+{
+    public function __construct(
+        protected readonly TreatmentCaseRepository    $cases,
+        protected readonly TreatmentSessionRepository $sessions,
+        protected readonly TreatmentCaseOpener        $opener,
+        protected readonly TreatmentScheduler         $scheduler,
+        protected readonly EntityManagerInterface     $em,
+    ) {}
+
+    public function supports(?string $practiceDomainCode): bool
+    {
+        return true;
+    }
+
+    public function openCase(
+        Appointment $appointment,
+        PatientRecord $record,
+        ServiceItem $service,
+        TreatmentProtocol $protocol,
+    ): TreatmentCase {
+        // بیماری که وسط دوره‌اش نوبت دیگری از همان سرویس می‌گیرد، جلسهٔ همان دوره را
+        // می‌گیرد نه یک دورهٔ موازی.
+        $case = $this->cases->findOpenFor($record, $service)
+            ?? $this->opener->open(
+                $record->getEntityType(),
+                $record->getEntityId(),
+                $record,
+                $service,
+                $protocol,
+            );
+
+        $this->attachToNextOpenSession($case, $appointment);
+
+        return $case;
+    }
+
+    public function onSessionFinished(TreatmentSession $session): void
+    {
+        $next = $this->scheduler->scheduleNextAfter($session);
+
+        if ($next === null) {
+            $this->closeIfEverySessionIsSettled($session->getTreatmentCase());
+        }
+
+        $this->em->flush();
+    }
+
+    /** نوبت به اولین جلسهٔ بدونِ نوبت وصل می‌شود، نه لزوماً به جلسهٔ اول. */
+    protected function attachToNextOpenSession(TreatmentCase $case, Appointment $appointment): void
+    {
+        $session = $this->sessions->findNextUnbooked($case);
+
+        if ($session === null) {
+            return;
+        }
+
+        $session->attachAppointment($appointment);
+        // سررسیدِ جلسه‌ای که نوبت گرفته دیگر حدس نیست — همان ساعت نوبت است.
+        $this->scheduler->seedFirstSession($session, $appointment->getSlotStart());
+        $this->em->flush();
+    }
+
+    protected function closeIfEverySessionIsSettled(TreatmentCase $case): void
+    {
+        foreach ($case->getSessions() as $session) {
+            if (!in_array($session->getStatus(), [TreatmentSession::STATUS_DONE, TreatmentSession::STATUS_CANCELLED], true)) {
+                return;
+            }
+        }
+
+        $case->close(TreatmentCase::STATUS_COMPLETED);
+    }
+}