Add GMAChain (Chain ID 4189)

[CATBEx]

Adds GMAChain EVM-compatible Clique PoA mainnet.

• Chain ID: 4189
• RPC: https://api.gmachain.xyz
• WebSocket: wss://api.gmachain.xyz/ws
• Native token: GMA (18 decimals)
• Website: https://gmachain.xyz

[changeset-bot]

⚠️ No Changeset found

Latest commit: 0c5d708

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[vercel]

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[jxom]

Closing as this does not meet the chain requirements:

• Chain ID 4189 is not registered in ethereum-lists/chains (a hard requirement).
• The RPC (https://api.gmachain.xyz) is not functional. It serves a TLS certificate for an unrelated domain (api.whappshare.online) and responds with a 502 Bad Gateway, so eth_chainId could not be verified.
• The block explorer URL (https://gmachain.xyz) is a landing page, not a block explorer.

There are also convention issues (export not in alphabetical order in src/chains/index.ts, missing changeset), but the above are blocking.

Feel free to open a new PR once the chain is merged into ethereum-lists/chains and has a publicly operational RPC.