feat : add RecurrenceHandler for auto-creating next recurring task

When a task transitions to a final status, archives the current task and creates
a new occurrence with recalculated dates. Adds TaskStatusRepository::findFirstNonFinal()
to assign the initial status to the new task.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/Repository/TaskStatusRepository.php

@@ -14,4 +14,16 @@ class TaskStatusRepository extends ServiceEntityRepository
     {
         parent::__construct($registry, TaskStatus::class);
     }
+
+    public function findFirstNonFinal(): ?TaskStatus
+    {
+        return $this->createQueryBuilder('s')
+            ->where('s.isFinal = :final')
+            ->setParameter('final', false)
+            ->orderBy('s.position', 'ASC')
+            ->setMaxResults(1)
+            ->getQuery()
+            ->getOneOrNullResult()
+        ;
+    }
 }