Fix consistency bug, rename Random to Auto, add stop-after-all, direction pills, copy-trade

Bug fixes:
- Fix computeDailyTarget when consistency is 0% or 100%: treat as no constraint,
  letting min-day reservation or full remaining profit drive the target
- Rename 'Random' to 'Auto' across entire codebase (types, API, UI, scheduler)

Features:
- Add "Stop after all eligible" checkbox: auto-stops scheduler when all
  configured accounts are dead, inactive, already traded, or challenge complete
- Show position direction in status pill: "Long" (green) / "Short" (red)
  instead of generic "In Trade" (blue)
- Add "Copy to Max" button: copies current trade direction to remaining
  eligible accounts up to max_concurrent_accounts limit

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/api/copy-trade/route.ts

@@ -0,0 +1,12 @@
+import { NextResponse } from 'next/server';
+import { copyTrade } from '@/lib/auto-trade';
+
+export async function POST() {
+    try {
+        const results = await copyTrade();
+        return NextResponse.json(results);
+    } catch (err: any) {
+        console.error('[POST /api/copy-trade]', err);
+        return NextResponse.json({ error: err?.message ?? 'Copy trade failed' }, { status: 500 });
+    }
+}