feat(okx): enable all supported EVM chains

[0xh3rman]

Summary

• Add 18 new EVM chains to OKX provider: Ethereum, SmartChain, Polygon, Arbitrum, Optimism, AvalancheC, OpBNB, Fantom, Gnosis, Blast, ZkSync, Linea, Celo, Sonic, Abstract, Berachain, Unichain, Monad
• Corresponding Rust-side PR in core repo adds matching SwapperChainAsset entries

Test plan

• pnpm build passes
• pnpm test passes (all OKX provider tests still green)
• Integration test with live OKX API on new chains

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly expands the capabilities of the OKX provider by integrating support for 18 additional EVM-compatible blockchain networks. This enhancement broadens the range of assets and chains available for swapping operations, improving the overall utility and reach of the platform.

Highlights

• EVM Chain Support: Added support for 18 new EVM chains to the OKX provider, including Ethereum, SmartChain, Polygon, Arbitrum, Optimism, AvalancheC, OpBNB, Fantom, Gnosis, Blast, ZkSync, Linea, Celo, Sonic, Abstract, Berachain, Unichain, and Monad.
• Core Repository Alignment: Ensured corresponding Rust-side updates in the core repository for matching SwapperChainAsset entries.

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