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>

main.go

@@ -64,6 +64,7 @@ func main() {
 			cfg.MaxDailyLoss,
 			cfg.MaxDrawdown,
 			cfg.StopTradingMinutes,
+			cfg.Leverage, // 传递杠杆配置
 		)
 		if err != nil {
 			log.Fatalf("❌ 初始化trader失败: %v", err)
@@ -79,7 +80,8 @@ func main() {
 
 	fmt.Println()
 	fmt.Println("🤖 AI全权决策模式:")
-	fmt.Println("  • AI将自主决定每笔交易的杠杆倍数（山寨币1-20倍，BTC/ETH最高50倍）")
+	fmt.Printf("  • AI将自主决定每笔交易的杠杆倍数（山寨币最高%d倍，BTC/ETH最高%d倍）\n",
+		cfg.Leverage.AltcoinLeverage, cfg.Leverage.BTCETHLeverage)
 	fmt.Println("  • AI将自主决定每笔交易的仓位大小")
 	fmt.Println("  • AI将自主设置止损和止盈价格")
 	fmt.Println("  • AI将基于市场数据、技术指标、账户状态做出全面分析")