feat: add Velas chain

[Zhangnong]

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PR-Codex overview

This PR introduces support for the Velas blockchain by adding a new chain definition and exporting it for use in the application.

Detailed summary

• Added a new entry for velas in src/chains/index.ts.
• Created velas chain definition in src/chains/definitions/velas.ts with:
  • id: 106
  • name: 'Velas EVM Mainnet'
  • nativeCurrency: VLX
  • rpcUrls: Includes Velas RPC endpoint
  • blockExplorers: Links to Velas Explorer
  • testnet: false

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Latest commit: e0a5e18

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

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