Feat: Add VIA network

[0xatomFusion]

Description and Related Issue(s)

This pull request introduces support for the VIA network, which is a fork of the ZK Stack. The addition ensures that Blockscout can properly index, display, and interact with the VIA blockchain, thereby extending its multi-chain support.

No related issues are being closed by this PR, but it lays the foundation for full VIA integration.

Proposed Changes

• Added initial support for the VIA network chain type.
• Configured necessary chain metadata and network settings.
• No changes to ENV variables were made in this PR.

Breaking or Incompatible Changes

None. This PR does not introduce breaking or incompatible changes. The new chain integration is additive and isolated from existing functionality.

Additional Information

The VIA network shares architectural similarities with ZK Stack chain, so existing logic was reusable with minimal modification. Future enhancements may include dedicated explorer features for VIA if needed.

Checklist for PR author

• I have tested these changes locally.
• I added tests to cover any new functionality, following this guide
• Whenever I fix a bug, I include a regression test to ensure that the bug does not reappear silently.
• If I have added, changed, renamed, or removed an environment variable
  • I updated the list of environment variables in the documentation
  • I made the necessary changes to the validator script according to the guide
  • I added "ENVs" label to this pull request