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//! SDK中间件系统(简化版) /// 中间件trait(占位符) pub trait Middleware { // 简化实现,后续可以扩展 } /// 中间件堆栈(占位符) #[derive(Debug, Default)] pub struct MiddlewareStack; impl MiddlewareStack { /// Create a new instance pub fn new() -> Self { Self::default() } }