feat(account): add ability to sign in with login code (#271)

Co-authored-by: Elias Schneider <login@eliasschneider.com>

backend/internal/dto/user_dto.go

@@ -24,7 +24,7 @@ type UserCreateDto struct {
 }
 
 type OneTimeAccessTokenCreateDto struct {
-	UserID    string    `json:"userId" binding:"required"`
+	UserID    string    `json:"userId"`
 	ExpiresAt time.Time `json:"expiresAt" binding:"required"`
 }