DXtrade platform for Tradeify247: percent fees, hard daily-loss stops, volatility sizing, every-day lanes

- DXtrade client (lib/dxtrade-class.ts): REST session login with lockout-safe
  backoff, 60s sync of accounts/metrics/positions/orders/transfers, history and
  fund transactions from cash transactions, day-start balance at the 22:00 UTC
  reset, CLOSE-by-positionCode exits (native OCO group, else a stop-first
  emulated pair), a cross-account hedge guard, stray-order reaper.
- Instrument selector: the firm's symbol map lists candidate symbols per CME
  root; the cheapest tradable one per unit of recent hourly volatility wins
  (spread + 2x commission [+ financing] / sigma).
- Fees: a firm's commission % of notional prices every fee off the fill; the
  take-profit is solved in closed form so the leg nets its target.
- Hard daily loss limit per account type: every leg carries a stop keeping the
  firm's day inside the limit less a 10% reserve and both fees (rounded in);
  a green day never widens it; no room or a refused bracket flattens.
- Notional sizing where the platform prices positions: target-hold volatility
  sizing or the symbol map's fixed notional, under a per-type notional cap.
- Every-day firms trade weekends/holidays; the scheduler runs lanes (futures,
  one per DXtrade firm) with their own hours, flat gate, mutex and batches.
- The catalog sync skips platforms this build doesn't know instead of treating
  them as Tradovate. One shared fireLeg replaces the duplicated batch/copy code.
- npm run check: fee/stop/sizing/hours/selector checks; scripts/dxtrade-smoke.mjs
  confirms the API against a real login before trading.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app/api/firms/route.ts

@@ -1,5 +1,5 @@
 import { NextResponse } from 'next/server';
-import { getCachedCatalog } from '@/lib/firm-catalog';
+import { getCachedCatalog, hasPlatformCredentials } from '@/lib/firm-catalog';
 import { getCredentials } from '@/lib/db';
 import type { FirmConfig } from '@/types';
 
@@ -18,9 +18,7 @@ export async function GET() {
     try {
         const result: FirmConfig[] = getCachedCatalog().map((firm) => {
             const creds = getCredentials(firm.id);
-            const hasCredentials = firm.platform === 'topstepx'
-                ? !!creds?.apiKey
-                : !!(creds?.username && creds?.password);
+            const hasCredentials = hasPlatformCredentials(firm.platform, creds);
             return {
                 id: firm.id,
                 firm: firm.name,
@@ -46,6 +44,9 @@ export async function GET() {
                     minDayStop: a.minDayStop,
                     combineCmeHolidays: a.combineCmeHolidays,
                     withdrawalStages: a.withdrawalStages,
+                    dailyLossLimit: a.dailyLossLimit ?? 0,
+                    maxNotional: a.maxNotional ?? 0,
+                    tradesEveryDay: a.tradesEveryDay === true,
                 })),
                 catalogUpdatedAt: firm.updatedAt,
             };