devex(contract): fix by formatting all contracts and adding formatting checks

[Hillzo]

closes #514

PR Description

This PR addresses formatting inconsistencies in the contracts workspace under issue #514. Previously, the contracts were formatted inconsistently (e.g., indents in function signatures and multiline comments), which caused the cargo formatting check in the CI pipeline to fail. However, because the CI check was allowed to continue on failure, it did not block PR builds.

To fix this:

1. All Rust files under the contract/ workspace have been formatted.
2. The GitHub action configuration has been modified to fail the build if any formatting check fails.
3. A local git pre-commit hook is provided to run formatting checks before commits are made.

These changes prevent unformatted code from reaching the remote repository and wasting CI resources.

Changes Made

• Formatted all Rust files under contract/**/*.rs to fix [contract][devex] Run cargo fmt on all contracts #514.
• Modified .github/workflows/ci.yml to remove continue-on-error: true from the cargo formatting check step to address [contract][devex] Run cargo fmt on all contracts #514.
• Created .githooks/pre-commit script to check formatting before commits for [contract][devex] Run cargo fmt on all contracts #514.

Testing

• Verified that formatting is clean by running the check command inside the contract directory:

  cargo fmt --all -- --check

  Result: Command exited successfully with code 0 (no diff).
• Verified the local pre-commit hook by executing the script directly:

  ./.git/hooks/pre-commit

  Result: Exited with code 0.

[Hillzo]

please kindly merge