Add challenges promotion

backend/app/schemas/challenge.py

@@ -1,10 +1,19 @@
 from datetime import datetime
 from pydantic import BaseModel, Field
 
-from app.models.challenge import ChallengeType, Difficulty, ProofType
+from app.models.challenge import ChallengeType, Difficulty, ProofType, ChallengeStatus
 from app.schemas.game import GameShort
 
 
+class ProposedByUser(BaseModel):
+    """Minimal user info for proposed challenges"""
+    id: int
+    nickname: str
+
+    class Config:
+        from_attributes = True
+
+
 class ChallengeBase(BaseModel):
     title: str = Field(..., min_length=1, max_length=100)
     description: str = Field(..., min_length=1)
@@ -36,11 +45,18 @@ class ChallengeResponse(ChallengeBase):
     game: GameShort
     is_generated: bool
     created_at: datetime
+    status: str = "approved"
+    proposed_by: ProposedByUser | None = None
 
     class Config:
         from_attributes = True
 
 
+class ChallengePropose(ChallengeBase):
+    """Schema for proposing a challenge by a participant"""
+    pass
+
+
 class ChallengeGenerated(BaseModel):
     """Schema for GPT-generated challenges"""
     title: str