feat: Add Aster DEX exchange support + fix precision issues

## Features
- Add full Aster DEX integration with Binance-compatible API
- Support Web3 authentication with API wallet system
- Add comprehensive Aster integration guide (ASTER_INTEGRATION.md)
- Add example Aster configuration (config.aster.example.json)
## Bug Fixes
- Fix precision error (code -1111) for all order types
- Implement proper float-to-string conversion with exchange precision
- Add automatic precision fetching from /exchangeInfo endpoint
- Remove trailing zeros from formatted values
## Documentation
- Update README.md with Aster quick start guide
- Add detailed setup instructions for creating API wallet
- Include troubleshooting FAQ and security best practices
- Update core features to mention three supported exchanges
## Technical Details
- Added formatFloatWithPrecision() helper function
- Updated all order functions to use proper precision formatting
- Added precision logging for debugging
- Fully backward compatible with existing configurations
Closes #[issue number if applicable]

trader/auto_trader.go

@@ -21,7 +21,7 @@ type AutoTraderConfig struct {
 	AIModel string // AI模型: "qwen" 或 "deepseek"
 
 	// 交易平台选择
-	Exchange string // "binance" 或 "hyperliquid"
+	Exchange string // "binance", "hyperliquid" 或 "aster"
 
 	// 币安API配置
 	BinanceAPIKey    string
@@ -31,6 +31,11 @@ type AutoTraderConfig struct {
 	HyperliquidPrivateKey string
 	HyperliquidTestnet    bool
 
+	// Aster配置
+	AsterUser       string // Aster主钱包地址
+	AsterSigner     string // Aster API钱包地址
+	AsterPrivateKey string // Aster API钱包私钥
+
 	CoinPoolAPIURL string
 
 	// AI配置
@@ -134,6 +139,12 @@ func NewAutoTrader(config AutoTraderConfig) (*AutoTrader, error) {
 		if err != nil {
 			return nil, fmt.Errorf("初始化Hyperliquid交易器失败: %w", err)
 		}
+	case "aster":
+		log.Printf("🏦 [%s] 使用Aster交易", config.Name)
+		trader, err = NewAsterTrader(config.AsterUser, config.AsterSigner, config.AsterPrivateKey)
+		if err != nil {
+			return nil, fmt.Errorf("初始化Aster交易器失败: %w", err)
+		}
 	default:
 		return nil, fmt.Errorf("不支持的交易平台: %s", config.Exchange)
 	}