Add SAX Chain (chainId 55080)

[saxchainorg]

This PR adds SAX Chain (EVM-compatible).

Name: SAX Chain
Chain ID: 55080 (EIP-155 unique)
RPC: https://rpc.saxchain.org (HTTPS)
Explorer: https://explorer.saxchain.org (EIP-3091 paths: /tx/, /address/, /block/)
Native currency: SAX (18 decimals)
Info URL: https://saxchain.org

Notes:

• Public RPC served behind Nginx + TLS (Let's Encrypt), rate-limited.
• We will open an issue on Chainlist to associate the network icon.

[github-actions]

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