Add full Next.js autotrader app with SQLite persistence and live Tradovate data

- SQLite DB (better-sqlite3) with firms, account_configs, firm_fees, instruments tables
- REST API routes: firms CRUD, account configs CRUD, state, accounts, instruments
- Live Tradovate WebSocket client: login, sync, positions, auto-liq thresholds
- Dashboard (app/page.tsx): per-firm account list with balance, day P&L, days traded,
  target progress, and Dead/Inactive/Flat status based on Tradovate auto-liq floors
- Account detail page: objectives progress, daily P&L chart, consistency tracking
- Per-firm settings page: account configs and instrument fee management
- Dead detection uses trailingMaxDrawdownLimit - trailingMaxDrawdown from
  userAccountAutoLiqs; filters Tradovate sentinel value (999999999 = no limit)
- FIFO P&L engine with commission accounting for daily P&L history
- Removed manual maxLoss fallback in favour of live Tradovate auto-liq data

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/api/firms/[id]/instrument-configs/[instrumentId]/route.ts

@@ -0,0 +1,41 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { upsertFirmInstrumentConfig } from '@/lib/db';
+
+export async function PUT(
+    req: NextRequest,
+    { params }: { params: Promise<{ id: string; instrumentId: string }> }
+) {
+    const { id: idStr, instrumentId: instrIdStr } = await params;
+    const firmId = parseInt(idStr, 10);
+    const instrumentId = parseInt(instrIdStr, 10);
+
+    if (isNaN(firmId) || isNaN(instrumentId)) {
+        return NextResponse.json({ error: 'Invalid id' }, { status: 400 });
+    }
+
+    const body = await req.json() as {
+        allinFee?: number;
+        roundtripFee?: number;
+        banned?: boolean;
+    };
+
+    if (
+        typeof body.allinFee !== 'number' ||
+        typeof body.roundtripFee !== 'number' ||
+        typeof body.banned !== 'boolean'
+    ) {
+        return NextResponse.json({ error: 'Invalid body' }, { status: 400 });
+    }
+
+    try {
+        upsertFirmInstrumentConfig(firmId, instrumentId, {
+            allinFee: body.allinFee,
+            roundtripFee: body.roundtripFee,
+            banned: body.banned,
+        });
+        return NextResponse.json({ success: true });
+    } catch (err) {
+        console.error('[PUT /api/firms/:id/instrument-configs/:instrumentId]', err);
+        return NextResponse.json({ error: 'Failed to save config' }, { status: 500 });
+    }
+}