Add invite links

backend/app/schemas/marathon.py

@@ -79,6 +79,19 @@ class JoinMarathon(BaseModel):
     invite_code: str
 
 
+class MarathonPublicInfo(BaseModel):
+    """Public info about marathon for invite page (no auth required)"""
+    id: int
+    title: str
+    description: str | None
+    status: str
+    participants_count: int
+    creator_nickname: str
+
+    class Config:
+        from_attributes = True
+
+
 class LeaderboardEntry(BaseModel):
     rank: int
     user: UserPublic