refactor: unify trading parameters and add USD1 token pool support

- Merge BuyParams and SellParams into unified SwapParams structure
- Add USD1 token pool support with related constants and configurations
- Refactor trade executor by combining buy_with_tip and sell_with_tip into swap method
- Update all protocol instruction builders to support new parameter structure
- Standardize ATA creation/closing parameter naming conventions
- Update example code to use new API interfaces
- Optimize trading logic with automatic direction detection based on input token type

src/trading/core/traits.rs

@@ -1,14 +1,11 @@
-use super::params::{BuyParams, SellParams};
+use crate::trading::SwapParams;
 use anyhow::Result;
 use solana_sdk::{instruction::Instruction, signature::Signature};
 
 /// 交易执行器trait - 定义了所有交易协议都需要实现的核心方法
 #[async_trait::async_trait]
 pub trait TradeExecutor: Send + Sync {
-    /// 使用MEV服务执行买入交易
-    async fn buy_with_tip(&self, params: BuyParams) -> Result<Signature>;
-    /// 使用MEV服务执行卖出交易
-    async fn sell_with_tip(&self, params: SellParams) -> Result<Signature>;
+    async fn swap(&self, params: SwapParams) -> Result<Signature>;
     /// 获取协议名称
     fn protocol_name(&self) -> &'static str;
 }
@@ -17,10 +14,10 @@ pub trait TradeExecutor: Send + Sync {
 #[async_trait::async_trait]
 pub trait InstructionBuilder: Send + Sync {
     /// 构建买入指令
-    async fn build_buy_instructions(&self, params: &BuyParams) -> Result<Vec<Instruction>>;
+    async fn build_buy_instructions(&self, params: &SwapParams) -> Result<Vec<Instruction>>;
 
     /// 构建卖出指令
-    async fn build_sell_instructions(&self, params: &SellParams) -> Result<Vec<Instruction>>;
+    async fn build_sell_instructions(&self, params: &SwapParams) -> Result<Vec<Instruction>>;
 }
 
 /// 协议特定参数trait - 允许每个协议定义自己的参数