IAV-1225/feat(public-tender): switch alert amount filter to MIN_AMOUNT
- Replace maxAmountThreshold with minAmountThreshold on wizard notification request and wizard status response DTOs.
- TenderFilteringServiceImpl: use MIN_AMOUNT with a floor rule (estimatedAmount >= threshold); exclude tenders with no parsed estimate when a positive threshold is set.
- PublicMarketWizardServiceImpl and PublicMarketConfigurationServiceImpl: persist and expose minAmountThreshold on PublicMarketAlertConfig.