Исправлены ошибки Wild Card и skip-assignment

- Wild Card: исправлен game.name → game.title
- Wild Card: добавлена поддержка игр типа playthrough
- points.py: добавлена проверка на None для challenge_points
- PlaythroughInfo: поля сделаны Optional (description, points, proof_type)
- organizer_skip_assignment: добавлен фильтр is_event_assignment

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/app/services/points.py

@@ -66,7 +66,7 @@ class PointsService:
     def calculate_drop_penalty(
         self,
         consecutive_drops: int,
-        challenge_points: int,
+        challenge_points: int | None,
         event: Event | None = None
     ) -> int:
         """
@@ -80,6 +80,10 @@ class PointsService:
         Returns:
             Penalty points to subtract
         """
+        # No penalty if no points defined
+        if challenge_points is None:
+            return 0
+
         # Double risk event = free drops
         if event and event.type == EventType.DOUBLE_RISK.value:
             return 0