Function computeBoostSplit

computeBoostSplit(
    opts: {
        app: DfsApp;
        baseMultiplier?: number | null;
        multiplier: number;
        profitBoostPct?: number | null;
        stake: number;
        totalPayout: number;
    },
): DfsPayoutSplit
PrizePicks: bonus is always 0 — withdrawable equals total.

Underdog: split logic (in priority order):
1. If baseMultiplier is supplied and the displayed multiplier exceeds it, bonus = stake × (multiplier - baseMultiplier).
2. Otherwise fall back to the documented profit-boost formula: bonus = (winnings - stake) × profit_boost_pct.
3. If neither is known, treat as no boost.
Parameters
- opts: {
      app: DfsApp;
      baseMultiplier?: number | null;
      multiplier: number;
      profitBoostPct?: number | null;
      stake: number;
      totalPayout: number;
  }
Returns DfsPayoutSplit
- Defined in grading.ts:562