fix: include blockchain fees in totalMinus calculation

[TaprootFreak]

Summary

• Bug fix: totalBlockchainFee was never included in totalMinus in getChangeLog() (since DEV-3275, Oct 2024), causing the Net Total on the Financial Log dashboard to be overstated
• DTO expansion: Expose bank and kraken expense categories in the financial changes API response for full transparency

Changes

log-job.service.ts

- const totalMinus = bankTxFee + totalKrakenFee + totalBinanceFee + totalRefReward;
+ const totalMinus = bankTxFee + totalKrakenFee + totalBinanceFee + totalRefReward + totalBlockchainFee;

financial-log.dto.ts + dashboard-financial.service.ts

• Added bank: number and kraken: { total, withdraw, trading } to the minus object in FinancialChangesEntryDto
• Added corresponding mapping in mapChangesLogToEntry()

Test plan

• Verify financial changes endpoint returns bank and kraken fields
• Verify minus.total now equals ref + binance + blockchain + bank + kraken
• Verify total equals plus.total - minus.total
• Compare dashboard Net Total before/after — expect lower values reflecting actual blockchain costs

Closes #3438