feat: Solaxy Chain support

[Marcolist]

Summary & Motivation

This PR adds support for the Solaxy (SVM) mainnet to the Phantom Wallet SDK.

• Introduces a new NetworkId.SOLAXY_MAINNET (solaxy:1936682104)
• Adds corresponding configuration to NETWORK_CONFIGS
• Includes CAIP-2 mapping, explorer URLs, and chain metadata
• No RPC endpoint added — Phantom manages its own RPCs internally
• Aligns with existing Solana-based network definitions for SVM compatibility

This addition enables developers to identify and interact with Solaxy accounts and explorers
through the standard SDK interfaces.

---

Did you add a changeset?

Yes

Run locally:

yarn changeset

[Marcolist]

Thanks for reviewing!
Solaxy is an SVM-based L2 compatible with Solana programs.
The provided metadata follows existing Solana mainnet conventions.
Looking forward to feedback and integration testing.

[Marcolist]

Hi @rafinskipg, all checks have passed. Could you please review or approve this Solaxy Chain support PR when you have time?

[Marcolist]

Hey @rafinskipg @nictrix @ArcticMango

I added support for the Solaxy (SVM) mainnet in this PR — it just introduces
NetworkId.SOLAXY_MAINNET (solaxy:1936682104) and the related config under NETWORK_CONFIGS.

Nothing breaking here:

• All checks passed
• Mirrors the existing Solana setup
• Includes CAIP-2 mapping + explorer URLs

Solaxy is a Sealevel-compatible L2 developed by Nitro Labs,
so it works with standard Solana RPC calls and tooling.
Would be awesome if one of you could take a quick look when you get a chance.

Thanks a lot for keeping the SDK in great shape! Really appreciate the work you all do!

Kind regards,
Marco