[BE] User Service

[glemenneo]

Create the User Service, responsible for user profile management.

• [BE] [User Service] Setup project and dependencies #6
• [BE] [User Service] Design user data model schema #7
• [BE] [User Service] Implement POST API for user creation #8
• [BE] [User Service] Implement GET APIs for fetching user data #9
• [BE] [User Service] Implement DELETE API for user removal #10
• [BE] [User Service] Implement PUT API for updating user information #11
• [BE] [User Service] Implement authentication API #12
• [BE] [User Service] Integrate JWT authorization tokens #13
• [BE] [User Service] Create JWT authorization middleware with role-based access control (RBAC) #14
• [BE] [User Service] Implement password reset functionality #15
• [BE] [User Service] Write unit tests for user service #16
• [BE] [User Service] Add Swagger API documentation #39