Feat: Integrate leverage configuration across trading system

- Pass leverage config through TraderManager to AutoTrader
- Add BTCETHLeverage and AltcoinLeverage fields to Context and AutoTraderConfig
- Update decision validation to use configured leverage limits
- Display configured leverage in startup message
- Update error messages to show current leverage limits
Changes:
- main.go: Pass leverage config to AddTrader, update startup message
- manager/trader_manager.go: Accept and forward leverage config
- trader/auto_trader.go: Store leverage config, pass to Context
- decision/engine.go: Use dynamic leverage limits in validation
This completes the leverage configuration feature implementation.
Co-Authored-By: tinkle-community <tinklefund@gmail.com>

trader/auto_trader.go

@@ -36,6 +36,10 @@ type AutoTraderConfig struct {
 	// 账户配置
 	InitialBalance float64 // 初始金额（用于计算盈亏，需手动设置）
 
+	// 杠杆配置
+	BTCETHLeverage  int // BTC和ETH的杠杆倍数
+	AltcoinLeverage int // 山寨币的杠杆倍数
+
 	// 风险控制（仅作为提示，AI可自主决定）
 	MaxDailyLoss    float64       // 最大日亏损百分比（提示）
 	MaxDrawdown     float64       // 最大回撤百分比（提示）
@@ -459,9 +463,11 @@ func (at *AutoTrader) buildTradingContext() (*decision.Context, error) {
 
 	// 6. 构建上下文
 	ctx := &decision.Context{
-		CurrentTime:    time.Now().Format("2006-01-02 15:04:05"),
-		RuntimeMinutes: int(time.Since(at.startTime).Minutes()),
-		CallCount:      at.callCount,
+		CurrentTime:      time.Now().Format("2006-01-02 15:04:05"),
+		RuntimeMinutes:   int(time.Since(at.startTime).Minutes()),
+		CallCount:        at.callCount,
+		BTCETHLeverage:   at.config.BTCETHLeverage,   // 使用配置的杠杆倍数
+		AltcoinLeverage:  at.config.AltcoinLeverage,  // 使用配置的杠杆倍数
 		Account: decision.AccountInfo{
 			TotalEquity:      totalEquity,
 			AvailableBalance: availableBalance,