feat: Multi-sig disputes, dynamic fee split, spectator tipping, anti-cheat deposits (#977, #978, #979, #980)

[khaadish]

khaadish - DeFi & Security Features

Issues Addressed

Closes #977 - Multi-sig Dispute Resolution

• Created multi-sig dispute system with configurable thresholds
• Voters can cast For/Against/Abstain votes
• Dispute resolves automatically when threshold is met
• Prevents double-voting with address tracking

Closes #978 - Dynamic Fee Split

• Configurable fee distribution: platform, creator, winner, treasury
• Basis points allocation (must total 10000)
• Per-game fee split calculation and storage
• Flexible reward distribution based on game outcome

Closes #979 - Spectator Tipping

• Spectators can tip players during live games
• Optional message with tip
• Tracks total tips received per player
• Game-specific tip history

Closes #980 - Anti-Cheat Security Deposit

• Players deposit security funds before playing
• Configurable min/max deposit amounts
• Refund after cooldown period (no cheating)
• Admin can seize deposits for cheating violations

Changes Made

Contracts

• contracts/game_contract/src/lib.rs - Added all 4 features

Technical Details

Multi-sig Vote Logic

if dispute.votes_for >= dispute.threshold {
    dispute.resolved = true;
}

Fee Split Calculation

platform_amount = total_prize * platform_fee_bips / 10000;
winner_amount = total_prize * winner_share_bips / 10000;
treasury_amount = total_prize - platform - creator - winner;

Deposit Refund Flow

if current_ledger >= deposit.deposited_at + refund_period {
    // Refund to player
} else {
    return Err(ContractError::DepositLocked);
}

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