chore: adjust failed response messages

[zetsux]

Description

This pull request updates user-related message constants in the core/helper/messages/user.go file to use clearer and more concise language. The main focus is on simplifying error and success messages for user operations.

Message improvements:

• Updated failure messages for user registration, update, delete, login, and picture operations to use more direct and concise wording (e.g., "Failed to register user" instead of "Failed to process user register request"). [1] [2]
• Improved consistency across all user operation messages, making them easier to read and understand for both developers and users. [1] [2]

Change

Check all options that are relevant.

• 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)

Checklist

• I have performed a self-review of my code
• I have made sure that my fix is effective / my feature works
• All other features still works locally with my changes
• I have made API documentation and example response in Postman

[Copilot]

Pull Request Overview

This PR simplifies error messages across user-related operations by making them more concise and direct. The changes remove verbose phrasing like "Failed to process user X request" and replace it with shorter "Failed to X user" patterns.

Key Changes:

• Standardized error message format from "Failed to process user [action] request" to "Failed to [action] user"
• Applied consistent phrasing across all user operation failures (register, login, update, delete, and picture operations)

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