Fix/core build error

[Yoo-SH]

Summary of Changes

Fixed critical build errors preventing the application from starting properly:

• Resolved OpenAPI version configuration issue that was causing build failures
• Fixed JPA auditing handler duplication error in Spring configuration

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)
• Documentation update
• Code refactoring
• Performance improvement
• Test addition

Related Issues

Addresses build errors and database connection issues that were preventing application startup.

Testing Instructions

1. Ensure Docker containers are running: docker-compose up -d postgres elasticsearch minio
2. Build the application: ./gradlew clean build
3. Run the application from IDE or using: ./gradlew bootRun
4. Verify the application starts successfully without build errors
5. Check that the application connects to PostgreSQL database without authentication errors

Screenshots (if applicable)

N/A - Backend configuration fixes

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

Additional Notes

• Fixed OpenAPI version build error that was preventing compilation
• Resolved JpaAuditingHandler duplication issue in Spring configuration
• These changes are essential for the application to start and run properly in the development environment
• All Docker services (PostgreSQL, Elasticsearch, MinIO) are now properly accessible from the application

[Copilot]

Pull Request Overview

This PR fixes critical build errors that were preventing the application from starting properly. The changes address two main issues: an OpenAPI version configuration problem and a JPA auditing handler duplication error in Spring configuration.

• Downgraded SpringDoc OpenAPI from version 2.7.0 to 2.6.0 to resolve build failures
• Removed @EnableJpaAuditing annotation from the main application class to fix Spring configuration duplication

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
core/build.gradle	Downgraded SpringDoc OpenAPI version from 2.7.0 to 2.6.0
core/src/main/java/com/opencontext/OpenContextApplication.java	Removed @EnableJpaAuditing annotation and its import

[Copilot]

[nitpick] The removal of @EnableJpaAuditing suggests it's configured elsewhere to avoid duplication. Consider adding a comment explaining where JPA auditing is configured instead, to help future developers understand the application's auditing setup.

Suggested change

	// Note: JPA auditing is enabled in AuditingConfig.java to avoid duplication of @EnableJpaAuditing.