chore: Add CODEOWNERS file for PR review automation

[Xhristin3]

Problem Statement

No CODEOWNERS file exists. PR reviews are not automatically assigned to package maintainers.

Evidence

.github/CODEOWNERS does not exist.

Impact

PRs may go unreviewed by domain experts. No automated ownership assignment means manual routing of reviews.

Proposed Solution

Create .github/CODEOWNERS with package-level ownership:

/api/        @xstreamroll/api-maintainers
/app/        @xstreamroll/app-maintainers
/xstreamroll-sdk/ @xstreamroll/sdk-maintainers
/xstreamroll-processing/ @xstreamroll/processing-maintainers
/database/   @xstreamroll/infra-maintainers
/.github/    @xstreamroll/infra-maintainers

Acceptance Criteria

• CODEOWNERS file exists
• Package paths mapped to appropriate teams/users
• File follows GitHub CODEOWNERS syntax

File Map

• .github/CODEOWNERS — new

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Labels: open-source, good first issue
Priority: Medium | Difficulty: Beginner | Estimated Effort: 0.5h

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Labels: open-source,good first issue
Priority: Medium | Difficulty: Beginner | Estimated Effort: 0.5h
Backlog ID: REPO-025

[shadrach68]

Hi maintainer, I am confident that I can resolve this issue before 24hrs if assigned to me because I have the technical expertise to resolve it.

[leandromasotti]

Hello! I can take a look. Thank you

[Topmatrixmor2014]

i have studied this issue description and i will deliver on this with great PR timely. LaLa

[grantfox-oss]

🦊 GrantFox — @Topmatrixmor2014 has been assigned to this issue as part of the Official Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #208)
2. Your PR will be reviewed by the XStreamRollz maintainers

Good luck! Track your progress on GrantFox.

[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Official Campaign campaign!

@Topmatrixmor2014's PR #272 was approved and merged by @Xhristin3.

🏆 @Topmatrixmor2014: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (48 total points). Track your full progress on GrantFox.

👏 Great work, @Topmatrixmor2014! Keep contributing to XStreamRollz.