Feat: upgrade Gala Chain SDK to 3.1.3 - #87

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-node@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

'poolA' is defined but never used

'token1Instance' is assigned a value but never used

'token0Instance' is assigned a value but never used

'token1Class' is assigned a value but never used

'token0Class' is assigned a value but never used

'DexV3Contract' is defined but never used

'transactionErrorKey' is defined but never used

'GalaChainResponseType' is defined but never used

'BatchDto' is defined but never used