Update GPT and add Profile

backend/app/schemas/user.py

@@ -58,3 +58,28 @@ class TokenResponse(BaseModel):
 class TelegramLink(BaseModel):
     telegram_id: int
     telegram_username: str | None = None
+
+
+class PasswordChange(BaseModel):
+    current_password: str = Field(..., min_length=6)
+    new_password: str = Field(..., min_length=6, max_length=100)
+
+
+class UserStats(BaseModel):
+    """Статистика пользователя по марафонам"""
+    marathons_count: int
+    wins_count: int
+    completed_assignments: int
+    total_points_earned: int
+
+
+class UserProfilePublic(BaseModel):
+    """Публичный профиль пользователя со статистикой"""
+    id: int
+    nickname: str
+    avatar_url: str | None = None
+    created_at: datetime
+    stats: UserStats
+
+    class Config:
+        from_attributes = True