feat(bounty): allow up to 15 competition prize tiers

[Benjtalkshow]

What

A competition bounty can now have up to 15 prize positions (was capped at 3).

MAX_PRIZE_TIERS 3 → 15 in modeSchema.ts — the single FE source of truth, so it propagates to the Mode step (winner-count stepper), the Reward step (tier inputs), and all validation/copy.

Why it's safe on-chain

The on-chain winner_distribution is derived from the tier amounts and normalized to 100% by the shared buildWinnerDistribution — the same path hackathons already use to publish many winners. The contract accepts arbitrary positions (the DTO default even documents "5% for the rest" beyond position 3), so 3 was a product guard, not a contract limit.

Paired change

Backend validation cap is bumped to match in boundless-nestjs (separate PR).

Verification

• tsc --noEmit — 0 errors.
• eslint . — clean.

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