feat: 所有参数移至config.json, 重构退出逻辑, 清理遗留接口

- 将所有硬编码参数迁移到 config.json (手续费率、止盈/止损阈值、
  超时、腿间隔、加仓步进等)
- 退出条件: 净利 >= take_profit_pct 止盈, 价差 <= 0 平仓
- 删除 Binance/dYdX 遗留代码
- 更新 README 文档
- Dashboard: 双交易所价格表、黑名单UI、按币名排序持仓
- Bitget WS: 文本ping保活
- 数据库: 重置, 无历史仓位

main.go

@@ -34,6 +34,10 @@ func main() {
 	loadDotEnv()
 	cfg := LoadConfig()
 
+	// Populate package-level taker fees from config (so scanner/dashboard/trader all use it)
+	takerFees[ExBitget] = cfg.TakerFeeBitget
+	takerFees[ExHyperLiquid] = cfg.TakerFeeHyperLiquid
+
 	store := NewPriceStore()
 	notifier := NewNotifier(cfg.TelegramBotToken, cfg.TelegramChatID)
 
@@ -58,9 +62,8 @@ func main() {
 	// P3-4: wire real-time trade event broadcast
 	trader.OnTradeEvent = dashboard.BroadcastEvent
 	if trader.IsConfigured() {
-		modeLabel := trader.ModeLabel()
-		log.Printf("[Trader] %s mode: automated trading ENABLED (threshold >= %.2f%%, $%.0f/trade)",
-			modeLabel, cfg.TradeThreshold, cfg.TradeAmountUSD)
+		log.Printf("[Trader] %s mode: automated trading ENABLED (threshold >= %.2f%%, $%.0f/leg, max %d positions, $%.0f capital)",
+			trader.ModeLabel(), cfg.TradeThreshold, cfg.TradeAmountUSD, cfg.MaxPositions, cfg.InitialCapital)
 		if cfg.TestMode {
 			log.Printf("[Trader] Using mock orders with %.3f%% slippage per leg", cfg.MockSlippagePct)
 		}
@@ -76,24 +79,18 @@ func main() {
 	sigCh := make(chan os.Signal, 1)
 	signal.Notify(sigCh, os.Interrupt, syscall.SIGUSR1)
 
-		// Collect symbols — skip exchanges the coin isn't listed on
-	var bnSymbols, bgSymbols, hlSymbols, dydxSymbols []string
+		// Collect symbols — only BG and HL for now (BN, dYdX disabled)
+	var bgSymbols, hlSymbols []string
 	for _, c := range TrackedCoins {
-		if c.BN != "" {
-			bnSymbols = append(bnSymbols, c.BN)
-		}
 		if c.BG != "" {
 			bgSymbols = append(bgSymbols, c.BG)
 		}
 		if c.HL != "" {
 			hlSymbols = append(hlSymbols, c.HL)
 		}
-		if c.HL != "" {
-			dydxSymbols = append(dydxSymbols, c.HL)
-		}
 	}
 
-	// Start all exchange WS connections
+	// Start exchange WS connections (BG + HL only)
 	startExchange := func(name string, runner func(func(string, float64, float64, float64)) error) {
 		go func() {
 			for {
@@ -112,10 +109,8 @@ func main() {
 		}()
 	}
 
-	startExchange("Binance", exchange.NewBinanceWS(bnSymbols).Run)
 	startExchange("HyperLiquid", exchange.NewHyperLiquidWS(hlSymbols).Run)
 	startExchange("Bitget", exchange.NewBitgetWS(bgSymbols).Run)
-	startExchange("dYdX", exchange.NewDydxWS(dydxSymbols).Run) // B#9: use dedicated symbol list
 
 	log.Println("[Monitor] Waiting for initial data...")
 	time.Sleep(10 * time.Second)