Remove the old generic risk-profile defaults from the user strategy bootstrap path and replace them with concrete Hyperliquid USDC equity presets that can be selected directly when creating an AI trader.
Add three ready-to-run strategy presets: a volume-ranked US stock trend preset, a fixed mega-cap preset covering AAPL-USDC/MSFT-USDC/GOOGL-USDC/AMZN-USDC/META-USDC, and a gainers-ranked US stock breakout preset.
Normalize the presets to use Hyperliquid-native stock discovery instead of AI500/OI crypto-style sources, with conservative defaults for max positions, leverage, margin usage, confidence, risk-reward, and multi-timeframe indicators.
Make default strategy synchronization idempotent for existing users: remove obsolete unused legacy preset rows, backfill the new US stock presets, and avoid overriding an already active custom strategy.
Update the trader creation modal preview labels so Hyperliquid stock ranking and fixed US stock sources are described clearly when users select a strategy.
Add API tests covering the new preset set, legacy preset cleanup, idempotent sync behavior, and preservation of an existing active custom strategy.
Verified with: go test ./api ./store; npm run build; docker compose up -d --build nofx nofx-frontend; backend /api/health; frontend HTTP 200; compose health checks.
