Refactor endpoint structure - /api/user endpoints

[dubisdev]

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• [x] I read the Contributing Guidelines

This pull request regarding on

• [ ] fixed an issue
• [ ] developed new feature
• [ ] fixed a bug

Briefly describe what you did

I have moved the login/logout and changepassword endpoints to /api/user to group related functionalities and add clarity to the project structure.

Appreciate your contribution to making Linkin better 🚀.

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[RizkyRajitha]

@dubisdev nice work 🔥 .