feat: ptsusde added to staging

[0xHarbs]

🤖 Linear

Closes CONG-XXX

[Copilot]

Pull request overview

This PR adds support for the PT-sUSDE (Pendle Token for sUSDE) asset to the mainnet staging environment, enabling cross-chain transfers between Ethereum and Solana chains.

• Adds PT-sUSDE asset configuration script with Ethereum and Solana chain support
• Defines asset addresses for PT-sUSDE on both chains in the staging environment
• Registers the new asset in the CLI configuration for deployment automation

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 5 comments.

File	Description
packages/contracts/script/assets/mainnetstaging/PTSUSDE.s.sol	New asset configuration script defining PT-sUSDE token setup with DEFAULT strategy for both Ethereum and Solana chains
packages/contracts/script/MainnetStaging.sol	Adds PT-sUSDE asset address constants for Ethereum and Solana networks to the MainnetAssets contract
packages/contracts/cli/config/assets/mainnetstaging.json	Registers PT-sUSDE asset entry in the staging configuration JSON for CLI deployment tools

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