Add documentation to EventBus module

[Lang-Qiu]

Problem Background

The EventBus module in src/shared/eventbus.js is a key component for inter-component communication in the Vue application, but it lacks documentation strings. This makes it challenging for developers to understand its purpose and usage, potentially leading to confusion or misuse.

Changes Made

• Added a JSDoc comment to the EventBus instance, clearly describing it as a Vue type used for inter-component communication in the Vue application. This enhances code readability and maintainability.

Verification

This change only adds documentation and does not modify any functionality. It can be verified through code review to ensure accuracy, and by running existing tests to confirm no regressions are introduced.

[owasp-dt-bot]

✅ Snyk checks have passed. No issues have been found so far.

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