Add marathon finish button and system

backend/app/api/v1/wheel.py

@@ -104,6 +104,10 @@ async def spin_wheel(marathon_id: int, current_user: CurrentUser, db: DbSession)
     if marathon.status != MarathonStatus.ACTIVE.value:
         raise HTTPException(status_code=400, detail="Marathon is not active")
 
+    # Check if marathon has expired by end_date
+    if marathon.end_date and datetime.utcnow() > marathon.end_date:
+        raise HTTPException(status_code=400, detail="Marathon has ended")
+
     participant = await get_participant_or_403(db, current_user.id, marathon_id)
 
     # Check no active regular assignment (event assignments are separate)
@@ -232,6 +236,10 @@ async def get_current_assignment(marathon_id: int, current_user: CurrentUser, db
     challenge = assignment.challenge
     game = challenge.game
 
+    # Calculate drop penalty (considers active event for double_risk)
+    active_event = await event_service.get_active_event(db, marathon_id)
+    drop_penalty = points_service.calculate_drop_penalty(participant.drop_count, active_event)
+
     return AssignmentResponse(
         id=assignment.id,
         challenge=ChallengeResponse(
@@ -255,6 +263,7 @@ async def get_current_assignment(marathon_id: int, current_user: CurrentUser, db
         streak_at_completion=assignment.streak_at_completion,
         started_at=assignment.started_at,
         completed_at=assignment.completed_at,
+        drop_penalty=drop_penalty,
     )