fix(txpool): derive accurate queued reason for SubPool::Blob #20095
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Blob subpool aggregates all non-pending blob transactions, not just those missing the blob fee. The previous implementation always reported InsufficientBlobFee, misclassifying cases such as nonce gaps, insufficient balance, too much gas, parked ancestors, or insufficient base fee. This change derives the queued reason for blob transactions from TxState flags in a consistent order (structural first, then fees), and adds unit tests to cover the major combinations. Sub-pool routing is unchanged; only the reported reason is corrected.