Update CI workflow: add cargo fmt check, clippy, and frontend build (…

[eogenyi23-creator]

Summary

Provide a short description of the change and the problem it fixes.

Related Issue

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What changed

• Contracts:
• Tests:
• Docs:
• Events / API / storage:

Verification

• What did you run to verify this change?
  • cargo test -p escrow
  • cargo test -p oracle
  • cargo fmt
  • cargo clippy

Checklist

• I added or updated tests covering this change.
• I updated documentation or confirmed no docs update is needed.
• I confirmed any event/API/storage changes are documented and backward-compatible.
• I manually verified the contract or CLI behavior where applicable.
• I linked this PR to the related issue.
• I included notes on any TTL or storage assumptions affecting contract state.

Notes

Add any additional details, risks, or follow-up tasks here.

closes #864
closes #863

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