Add shop

backend/app/schemas/assignment.py

@@ -77,12 +77,14 @@ class CompleteResult(BaseModel):
     streak_bonus: int
     total_points: int
     new_streak: int
+    coins_earned: int = 0  # Coins earned (only in certified marathons)
 
 
 class DropResult(BaseModel):
     penalty: int
     total_points: int
     new_drop_count: int
+    shield_used: bool = False  # Whether shield consumable was used to prevent penalty
 
 
 class EventAssignmentResponse(BaseModel):