Implement Logout functionality

<UserStory> ADM004: Logout </UserStory>

<Changes>
    1. Added AuthenticationManagementService::logout to clear authenticated user session.
    2. Integrated logout handling in Controller::logout to delegate session termination.
    3. Updated AdminMenu::logout and TechnicianMenu::logout to call Controller::logout for consistent session management.
    4. Extended TechnicianMenu.h with logout method declaration.
    5. Ensured session termination returns control to main menu after logout.
</Changes>

<Test>

  Precondition:
  1. User is logged into the system (Admin or Technician).
  2. AuthenticationManagementService maintains active session.
  3. Controller is connected to AuthenticationManagementService.

  Steps:
  1. Navigate to Admin or Technician Menu.
  2. Select "Logout" option.
    - Verify that AuthenticationManagementService::logout clears authenticated user.
  3. Session is terminated.
    - Verify that system confirms logout and invalidates session.
  4. Console returns to main menu.
    - Verify that user is redirected to main menu and must log in again to continue.
</Test>

<Review>
Sreeja Reghukumar
</Review>

Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/controllers/Controller.cpp

@@ -7,6 +7,7 @@ bool Controller::login(const std::string& username, const std::string& password)
 
 void Controller::logout()
 {
+    m_authenticationManagementService.logout();
 }
 
 void Controller::changePassword(const std::string& newPassword)

Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/controllers/Controller.h

@@ -2,6 +2,7 @@
 #include "Map.h"
 #include <string>
 #include "Enums.h"
+#include "AuthenticationManagementService.h"
 
 class Service;
 class ComboPackage;
@@ -14,6 +15,8 @@ class Notification;
 
 class Controller
 {
+private:
+    AuthenticationManagementService  m_authenticationManagementService;
 public:
     bool login(const std::string& username, const std::string& password);
     void logout();

Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/AuthenticationManagementService.cpp

@@ -1,3 +1,8 @@
 #include "AuthenticationManagementService.h"
 
 User* AuthenticationManagementService::m_authenticatedUser = nullptr;
+
+void AuthenticationManagementService::logout()
+{
+	m_authenticatedUser = nullptr;
+}

Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/AdminMenu.cpp

@@ -34,6 +34,7 @@ bool AdminMenu::handleOperation(int choice)
 
 void AdminMenu::logout()
 {
+	m_controller.logout();
 }
 
 void AdminMenu::changePassword()

Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/TechnicianMenu.cpp

@@ -38,3 +38,8 @@ void TechnicianMenu::completeJob()
 void TechnicianMenu::viewNotifications()
 {
 }
+
+void TechnicianMenu::logout()
+{
+	m_controller.logout();
+}

Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/TechnicianMenu.h

@@ -10,4 +10,5 @@ public:
     void showMenu();
     void completeJob();
     void viewNotifications();
+    void logout();
 };