feat: add cross-chain integration tests for bridge initialization #335

[midexol]

Description

This PR implements integration tests for the cross-chain bridge module as requested in issue #335.

Changes

• Created cross_chain_tests.rs to validate bridge logic.
• Implemented test for bridge initialization and access control.
• Verified that double initialization is prevented.
• Registered the new test module in lib.rs.

Acceptance Criteria

• Test cross-chain logic setup
• Verify bridge initialization
• Test error scenarios (Double initialization)

Closes #335

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