test: add comprehensive tests for contract initialization

[Devsol-01]

Description

This PR introduces a full test suite for the contract initialization logic to ensure correctness, security, and long-term maintainability. The tests validate proper initialization behavior, prevent re-initialization attacks, and verify correct storage and event setup.

The goal is to guarantee safe deployment and meet the required minimum of 95% test coverage for initialization-related logic.

Changes

• Added comprehensive initialization tests in src/test.rs
• Covered successful contract initialization
• Added security tests to prevent re-initialization
• Tested invalid admin address handling
• Verified correct event emission during initialization
• Verified all required storage values are properly initialized
• Included edge case tests for robustness
• Added inline test documentation for clarity

Test Coverage

• Initialization logic coverage exceeds 95%
• All critical paths and failure cases tested
• Edge cases and security-sensitive behavior validated

Testing Checklist

• ✅ Successful initialization works as expected
• ✅ Re-initialization is correctly prevented
• ✅ Invalid admin addresses are rejected
• ✅ Initialization event is emitted
• ✅ Storage keys are properly set on init
• ✅ All tests pass locally with coverage enabled

closes #195

[greatest0fallt1me]

@Devsol-01 please fix the pipeline

[Devsol-01]

@greatest0fallt1me Pipeline has been fixed
please if possible do well to give some compliments on drips

[greatest0fallt1me]

@Devsol-01, please resolve the conflicts.

[Devsol-01]

@greatest0fallt1me please review again