fix: remove erroneous 10^6 multiplier in claim_payout accounting

[optimus-fulcria]

Summary

This PR fixes a critical accounting bug in the claim_payout function where project.balance and project.raised were being inflated by a factor of 10^6 compared to the actual tokens transferred.

Bug Details

File: programs/stockpile-v2/src/instructions/claim_payout.rs

The adj_payout variable was being multiplied by 10^6 after the token transfer but before updating project accounting:

// Tokens transferred: adj_payout
token::transfer(..., adj_payout)?;

// Bug: multiplied AFTER transfer
adj_payout *= 10_u64.pow(6) as u64;

// project.balance now 10^6x higher than actual tokens
project.raised += adj_payout;
project.balance += adj_payout;

Impact

1. Fund Locking: withdraw_all uses project.balance.into() as the transfer amount, which would fail due to insufficient funds (trying to transfer 10^6x more tokens than available)

2. Accounting Inconsistency: Projects would report inflated raised amounts

Fix

Removed the erroneous 10^6 multiplication so project accounting matches actual token amounts.

Testing

The fix is straightforward - removing one line of code. The existing test suite should validate that claims and withdrawals work correctly with consistent amounts.

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Found during Superteam Earn security bounty audit