我来拆解一下Fluid的 smart vault/smart debt 为啥不成立。 这个结构的损益结构是这样的： Pnl = Lending APR a + Lending APR b + Fee - Lending NL% - Lending IL% - Ltv * (Borrow APR a + Borrow APR b -Fee + Borrow NL % + Borrow IL%)