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]

manager/trader_manager.go

@@ -41,6 +41,9 @@ func (tm *TraderManager) AddTrader(cfg config.TraderConfig, coinPoolURL string,
 		BinanceSecretKey:      cfg.BinanceSecretKey,
 		HyperliquidPrivateKey: cfg.HyperliquidPrivateKey,
 		HyperliquidTestnet:    cfg.HyperliquidTestnet,
+		AsterUser:             cfg.AsterUser,
+		AsterSigner:           cfg.AsterSigner,
+		AsterPrivateKey:       cfg.AsterPrivateKey,
 		CoinPoolAPIURL:        coinPoolURL,
 		UseQwen:               cfg.AIModel == "qwen",
 		DeepSeekKey:           cfg.DeepSeekKey,