Fix inconsistent json naming

[LightJack05]

Closes #28

[Copilot]

Pull request overview

This pull request fixes inconsistent JSON field naming in the userPatchBody struct by changing from camelCase to snake_case, ensuring consistency with other user-related structures (userBody and userGetResponse). The issue was identified in PR #27 where displayName and activityLevel used camelCase while all other user fields and API structures in the codebase use snake_case.

Changes:

• Updated userPatchBody struct in patch.go to use snake_case for display_name and activity_level
• Updated Swagger/OpenAPI documentation files to reflect the corrected field names

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
internal/handlers/userhandler/patch.go	Changed JSON tags from camelCase (displayName, activityLevel) to snake_case (display_name, activity_level)
docs/swagger.yaml	Updated OpenAPI schema to reflect snake_case field names
docs/swagger.json	Updated OpenAPI schema to reflect snake_case field names
docs/docs.go	Updated embedded OpenAPI schema to reflect snake_case field names

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