Publish erros fix

[Bojan131]

• **Fixed replication failures ("Not replicated to enough nodes") - added semaphore to limit concurrent replications and wrapped individual node messages in try/catch so one failing node doesn't kill the whole operation
• Fixed local get failures - added pending storage cache fallback so gets work right after publish
• Added retry logic for transient blockchain errors (socket hang up, connection reset, 502/503, fee too low, etc.) with gas bump only for nonce/fee errors, not network errors
• Fixed BigNumber NaN bug in gas price calculation during retries
• Fixed double gwei-parsing in Gnosis gas price comparison
• Fixed memory leak in merkle root index - entries were never cleaned up