refactor(megaeth): use standard config like Apechain

- Add MegaETH to same case block as Apechain (no special gas handling)
- Remove skipGasEstimation and defaultGasEstimate from interface
- Remove all MegaETH-specific code from deploy.ts
- MegaETH now uses standard gas params like other chains

Ticket: WIN-8361

Author: manojkumar138

scripts/chainConfig.ts

@@ -8,8 +8,6 @@ export interface ChainConfig {
   forwarderFactoryContractName: string;
   contractPath: string;
   gasParams: GasParams;
-  skipGasEstimation?: boolean; // For chains that need auto gas estimation
-  defaultGasEstimate?: number; // Default gas estimate when skipping actual estimation
 }
 
 export type GasParams = {
@@ -50,8 +48,6 @@ export async function getChainConfig(chainId: number): Promise<ChainConfig> {
   let forwarderContractName = 'Forwarder';
   let forwarderFactoryContractName = 'ForwarderFactoryV4';
   let contractPath = `contracts/${walletImplementationContractName}.sol:${walletImplementationContractName}`;
-  let skipGasEstimation = false;
-  let defaultGasEstimate: number | undefined = undefined;
 
   switch (chainId) {
     case CHAIN_IDS.ETH_MAINNET:
@@ -110,6 +106,8 @@ export async function getChainConfig(chainId: number): Promise<ChainConfig> {
     case CHAIN_IDS.PHAROS_TESTNET:
     case CHAIN_IDS.APECHAIN:
     case CHAIN_IDS.APECHAIN_TESTNET:
+    case CHAIN_IDS.MEGAETH:
+    case CHAIN_IDS.MEGAETH_TESTNET:
     case CHAIN_IDS.CORE_DAO:
     case CHAIN_IDS.CORE_DAO_TESTNET:
     case CHAIN_IDS.LINEAETH:
@@ -249,15 +247,6 @@ export async function getChainConfig(chainId: number): Promise<ChainConfig> {
       forwarderFactoryContractName = 'ForwarderFactoryV4';
       break;
 
-    case CHAIN_IDS.MEGAETH_TESTNET:
-    case CHAIN_IDS.MEGAETH:
-      // MegaETH requires auto gas estimation - gasLimit will be removed during deployment
-      skipGasEstimation = true;
-      defaultGasEstimate = 3_000_000; // Used for balance check when skipping estimation
-      forwarderContractName = 'ForwarderV4';
-      forwarderFactoryContractName = 'ForwarderFactoryV4';
-      break;
-
     case CHAIN_IDS.HBAREVM:
     case CHAIN_IDS.HBAREVM_TESTNET:
 
@@ -334,8 +323,6 @@ export async function getChainConfig(chainId: number): Promise<ChainConfig> {
     forwarderContractName,
     forwarderFactoryContractName,
     contractPath,
-    gasParams,
-    skipGasEstimation,
-    defaultGasEstimate
+    gasParams
   };
 }

scripts/deploy.ts

@@ -29,16 +29,7 @@ async function main() {
   const chainConfig = await getChainConfig(Number(chainId));
   const output: DeploymentAddresses = loadOutput();
 
-  let gasOverrides: any = chainConfig.gasParams;
-
-  // For chains that need auto gas estimation, remove gasLimit
-  if (chainConfig.skipGasEstimation) {
-    const { gasLimit, ...gasOverridesWithoutLimit } = gasOverrides;
-    gasOverrides = gasOverridesWithoutLimit;
-    console.log(
-      'ℹ️  Chain configured for auto gas estimation (no gasLimit override)'
-    );
-  }
+  const gasOverrides = chainConfig.gasParams;
 
   // Handle BigBlocks setup automatically if supported
   if (isBigBlocksSupported(Number(chainId))) {
@@ -56,33 +47,22 @@ async function main() {
   // Estimate gas costs for all potential deployments
   let totalEstimatedCost = 0n;
 
-  // For chains with very high gas limits (like Mantle) or chains that skip gas estimation
-  const useConfiguredGasLimit =
-    gasOverrides.gasLimit && gasOverrides.gasLimit > 10_000_000_000;
+  // For chains with very high gas limits (like Mantle), skip estimation and use configured limit
+  const useConfiguredGasLimit = gasOverrides.gasLimit > 10_000_000_000; // > 10 billion
 
   if (useConfiguredGasLimit) {
     console.log(
       `⚠️  Using configured gas limit (${gasOverrides.gasLimit}) instead of estimation for this chain`
     );
-  } else if (chainConfig.skipGasEstimation) {
-    console.log(
-      'ℹ️  Skipping gas estimation, will use auto-estimation during deployment'
-    );
   }
 
   // Only estimate if we need to deploy (not already deployed)
   if (
     !output.walletImplementation ||
     !(await isContractDeployed(output.walletImplementation))
   ) {
-    if (useConfiguredGasLimit && gasOverrides.gasLimit) {
+    if (useConfiguredGasLimit) {
       totalEstimatedCost += BigInt(gasOverrides.gasLimit);
-    } else if (
-      chainConfig.skipGasEstimation &&
-      chainConfig.defaultGasEstimate
-    ) {
-      // Skip estimation - use configured default for cost check
-      totalEstimatedCost += BigInt(chainConfig.defaultGasEstimate);
     } else {
       const WalletSimple = await ethers.getContractFactory(
         chainConfig.walletImplementationContractName
@@ -99,13 +79,8 @@ async function main() {
     !output.walletFactory ||
     !(await isContractDeployed(output.walletFactory))
   ) {
-    if (useConfiguredGasLimit && gasOverrides.gasLimit) {
+    if (useConfiguredGasLimit) {
       totalEstimatedCost += BigInt(gasOverrides.gasLimit);
-    } else if (
-      chainConfig.skipGasEstimation &&
-      chainConfig.defaultGasEstimate
-    ) {
-      totalEstimatedCost += BigInt(chainConfig.defaultGasEstimate);
     } else {
       const WalletFactory = await ethers.getContractFactory(
         chainConfig.walletFactoryContractName
@@ -125,13 +100,8 @@ async function main() {
     !output.forwarderImplementation ||
     !(await isContractDeployed(output.forwarderImplementation))
   ) {
-    if (useConfiguredGasLimit && gasOverrides.gasLimit) {
+    if (useConfiguredGasLimit) {
       totalEstimatedCost += BigInt(gasOverrides.gasLimit);
-    } else if (
-      chainConfig.skipGasEstimation &&
-      chainConfig.defaultGasEstimate
-    ) {
-      totalEstimatedCost += BigInt(chainConfig.defaultGasEstimate);
     } else {
       const ForwarderV4 = await ethers.getContractFactory(
         chainConfig.forwarderContractName
@@ -148,13 +118,8 @@ async function main() {
     !output.forwarderFactory ||
     !(await isContractDeployed(output.forwarderFactory))
   ) {
-    if (useConfiguredGasLimit && gasOverrides.gasLimit) {
+    if (useConfiguredGasLimit) {
       totalEstimatedCost += BigInt(gasOverrides.gasLimit);
-    } else if (
-      chainConfig.skipGasEstimation &&
-      chainConfig.defaultGasEstimate
-    ) {
-      totalEstimatedCost += BigInt(chainConfig.defaultGasEstimate);
     } else {
       const ForwarderFactory = await ethers.getContractFactory(
         chainConfig.forwarderFactoryContractName