test: verify SonarCloud duplicate and code smell detection

[JakeConal]

Purpose

Temporary SonarCloud verification PR. DO NOT MERGE.

• Adds two intentionally duplicated Java blocks (more than 10 successive statements) in one Sonar project.
• Adds System.out.println to trigger a Java code smell.
• Expected SonarCloud PR analysis: duplicated lines/blocks above zero and at least one new code smell.

Delete this branch and close the PR after recording the SonarCloud result.

[Copilot]

Copilot was unable to review this pull request because the user who requested the review has reached their quota limit.

[sonarqubecloud]

Quality Gate failed for 'cart'

Failed conditions
0.0% Coverage on New Code (required ≥ 80%)
54.5% Duplication on New Code (required ≤ 3%)

See analysis details on SonarQube Cloud