chore: add CODEOWNERS to fix code owner approval not being accepted

[Copilot]

Without a .github/CODEOWNERS file, GitHub cannot resolve who satisfies "Require review from Code Owners" branch protection — even the repository owner's approval is rejected.

Description

Adds .github/CODEOWNERS assigning @alirezanet as owner of all files (*), so their PR approvals satisfy the required code owner review and unblock merges.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• I have performed a self-review of my code
• I have added tests that prove my fix is effective or that my feature works
• I have made corresponding changes to the documentation
• I have commented my code, particularly in hard-to-understand areas
• New and existing unit tests pass locally with my changes
• I did test corresponding changes on Windows
• I did test corresponding changes on Linux
• I did test corresponding changes on Mac

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