Update Mars Credit (110110): RPC, explorer, features

[lifeofjer]

Summary

Updates the Mars Credit chain definition (chain ID 110110) with current infrastructure:

• RPC: Replace stale Railway endpoint with production RPC (rpc.marscredit.xyz)
• Explorer: Add BlockScout block explorer (blockscan.marscredit.xyz, EIP-3091)
• Features: Declare EIP-155 and EIP-1559 support (London fork active from genesis)
• Info URL: Update to current domain (marscredit.org)
• Native currency: Fix display name from "Mars Credit" to "Mars"
• Cleanup: Remove incorrect slip44: 1 (testnet coin type) and empty redFlags array

Context

Mars Credit is a proof-of-work EVM chain (Geth 1.10.18 fork). The existing listing had outdated RPC endpoints and missing explorer/feature metadata. This PR brings the listing up to date so wallets and dApps can properly discover and interact with the network.

Verification

• RPC: curl -X POST -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"eth_chainId","params":[],"id":1}' https://rpc.marscredit.xyz returns 0x1adfe (110110)
• Explorer: https://blockscan.marscredit.xyz (live BlockScout instance)
• Website: https://marscredit.org
• Icon IPFS CID unchanged: bafybeiaqvko45oh3bppsx57i73ajopgm2nsy4v6a22wwrbhbaoe5olwwlm

[github-actions]

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