fix: HL balance now reads spot USDC via SpotUserState

HL testnet USDC lives in the spot account, not the perp clearinghouse.
GetBalance() was calling UserState() (perp clearinghouseState), which
returned /usr/bin/bash. Switched to SpotUserState() and parse USDC.total - USDC.hold.

Also cleaned up .gitignore to exclude .env, binary, logs, data/.

dashboard.go

@@ -579,10 +579,22 @@ func (d *Dashboard) handleStatus(w http.ResponseWriter, r *http.Request) {
 	positions := d.trader.ReadSnapshot()
 	converged, diverged, flat, total := d.trader.GetClosedStats()
 
+	// Format exchange funds (snake_case, like SSE)
+	exFunds := d.trader.GetExchangeFunds()
+	exFundsMap := make(map[string]map[string]float64, len(exFunds))
+	for ex, ef := range exFunds {
+		exFundsMap[ex] = map[string]float64{
+			"balance":   math.Round(ef.Balance*100) / 100,
+			"total_fee": math.Round(ef.TotalFee*100) / 100,
+			"total_pnl": math.Round(ef.TotalPnl*100) / 100,
+		}
+	}
+
 	resp := map[string]interface{}{
-		"prices":    snap,
-		"positions": len(positions),
-		"stats":     map[string]int{"total": total, "converged": converged, "diverged": diverged, "flat": flat},
+		"prices":         snap,
+		"positions":      len(positions),
+		"stats":          map[string]int{"total": total, "converged": converged, "diverged": diverged, "flat": flat},
+		"exchange_funds": exFundsMap,
 	}
 	writeJSON(w, resp)
 }