Refactor duplicated code into shared utilities

[devin-ai-integration]

Summary

Extracts repeated boilerplate in the frontend web3 helpers and the Hardhat scripts into shared utilities. No behavior change — public function signatures are preserved and the frontend build + both TS typechecks pass.

frontend/src/helpers/web3.ts

Every callX function repeated the same wrappers. Collapsed into two private helpers:

• Read calls (callNumTasks, callGetTasks, callNumSubmissions, callGetSubmissions) were each new Promise(async (res,rej)=>{ try{ res(await contract.methods.X().call()) }catch(e){rej(e)} }) → now callContractMethod(contract, "X", [args]).
• Write calls (callMakeTask, callSubmit, callAssignWinner) each duplicated the Klaytn gas/gasPrice estimation + .send(..., callback) dance → now sendContractMethod(contract, method, args, chainId, { from, value? }):

function sendContractMethod(contract, method, args, chainId, txParams) {
  // klaytn-only gasPrice + estimateGas, then contract.methods[method](...args).send(...)
}

frontend/src/helpers/utilities.ts

convertStringToHex and convertNumberToString were defined identically in both utilities.ts and bignumber.ts. Removed the copies in utilities.ts and re-export them from ./bignumber (keeps existing helpers/utilities importers working).

blockchain/scripts/

Added scripts/utils.ts and routed the scripts through it, removing copy-pasted boilerplate: loadDeployment / saveDeployment (deployment.json), loadArtifactAbi, attachDDALLE (getContractFactory("DDALLE").attach), findEvent(receipt, name) (replaces inline receipt.events?.filter(e=>e.event===name)[0]), and runMain(main) (replaces the repeated main().catch(...) footer). Applied across deploy, makeTask, makeSubmission, listTasks, assignWinner, giveETH.

Link to Devin session: https://app.devin.ai/sessions/98a1211fd774434aa2714c7532d5766a
Requested by: @walnutwaldo

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