Align fact package with conventions

[Kyle9410-Chen]

Type of changes

refactor

Purpose

• Return entity instead of dto in fact service
• Return ResponseEntity<Object> instead of Object in fact controller

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ JAVA	checkstyle	2		0	2.84s
✅ REPOSITORY	dustilock	yes		no	0.02s
✅ REPOSITORY	gitleaks	yes		no	1.12s
✅ REPOSITORY	git_diff	yes		no	0.01s
✅ REPOSITORY	grype	yes		no	10.87s
✅ REPOSITORY	secretlint	yes		no	1.47s
✅ REPOSITORY	syft	yes		no	1.52s
✅ REPOSITORY	trivy-sbom	yes		no	0.13s
✅ REPOSITORY	trufflehog	yes		no	3.88s

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