Add YNX Testnet

[JiahaoAlbus]

Add YNX Testnet

Adds YNX Testnet to viem/chains as ynxTestnet.

• Chain ID: 6423
• Chain ID hex: 0x1917
• Native currency: YNXT
• Decimals: 18
• HTTP RPC: https://evm.ynxweb4.com
• Explorer: https://explorer.ynxweb4.com
• Website: https://ynxweb4.com
• Faucet: https://www.ynxweb4.com/dapp/faucet
• Testnet: Yes

YNX Testnet is already registered in ethereum-lists/chains as Chain ID 6423 via ethereum-lists/chains#8531.

The PR includes the chain definition, viem/chains export, and a patch changeset.

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[changeset-bot]

🦋 Changeset detected

Latest commit: cdfa914

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
viem	Patch

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[JiahaoAlbus]

@jxom Hi! When you have a chance, could you please review this YNX Testnet chain addition? The chain is already registered in ethereum-lists/chains as Chain ID 6423, and this PR includes the chain definition, export, and patch changeset. Thanks!