server/asset/eth: Fix unset contractVer in TokenBackend#3617
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TokenBackend() never set AssetBackend.contractVer, leaving it at the zero value regardless of the token's actual contract version. That field is read directly by the tx-not-found redeem fallback and by relay coin construction, so v1 tokens (e.g. usdc.polygon) hit a spurious "wrong contract version" error whenever a redeem tx wasn't yet visible to the node, and gasless (relay) token redemptions failed outright. Also zero-initializes the fallback coin's gas fields to match relayBaseCoin and avoid a nil big.Int panic in FeeRate.
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TokenBackend()never setAssetBackend.contractVer, so it stayed at 0 for every token regardless of actual contract version.relayBaseCoinand avoid a nilbig.Intpanic inFeeRate.