Implement Add Technician Functionality

<UserStory> ADM001: Add Technician </UserStory>

<Changes>
    1. Added UserManagementService integration in Controller to support technician account creation.
    2. Updated Controller::createTechnician method to call createUser with util::UserType::TECHNICIAN.
    3. Renamed parameter from 'phone' to 'phoneNumber' for clarity and consistency.
    4. Enhanced AdminMenu::addTechnician with input validation for password, email, and phone number.
    5. Added success and error handling messages in AdminMenu for technician creation workflow.
</Changes>

<Test>

  Precondition:
  1. Admin is logged into the system.
  2. UserManagementService is available and connected.
  3. No existing technician account with the same username/email.

  Steps:
  1. Navigate to Admin Menu and select "Add Technician".
  2. Enter technician details (username, password, email, phone number).
    - Verify that invalid password/email/phone inputs are rejected with error messages.
  3. Enter valid technician details.
    - Verify that uniqueness is checked and duplicate accounts are not created.
  4. Submit valid details.
    - Verify that technician account is created successfully and confirmation message is displayed.
</Test>

<Review>
Sreeja Reghukumar
</Review>

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

@@ -22,8 +22,9 @@ const User* Controller::getAuthenticatedUser()
     return nullptr;
 }
 
-void Controller::createTechnician(const std::string& username, const std::string& password, const std::string& email, const std::string& phone)
+void Controller::createTechnician(const std::string& username, const std::string& password, const std::string& email, const std::string& phoneNumber)
 {
+    m_userManagementService.createUser(username, password, email, phoneNumber, util::UserType::TECHNICIAN);
 }
 
 void Controller::updateUserDetails(const std::string& email, const std::string& phone)

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

@@ -2,6 +2,7 @@
 #include "Map.h"
 #include <string>
 #include "Enums.h"
+#include "UserManagementService.h"
 
 class Service;
 class ComboPackage;
@@ -14,13 +15,15 @@ class Notification;
 
 class Controller
 {
+private:
+    UserManagementService m_userManagementService;
 public:
     bool login(const std::string& username, const std::string& password);
     void logout();
     void changePassword(const std::string& newPassword);
     void createCustomer(const std::string& username, const std::string& password, const std::string& email, const std::string& phone);
     const User* getAuthenticatedUser();
-    void createTechnician(const std::string& username, const std::string& password, const std::string& email, const std::string& phone);
+    void createTechnician(const std::string& username, const std::string& password, const std::string& email, const std::string& phoneNumber);
     void updateUserDetails(const std::string& email, const std::string& phone);
     util::Map<std::string, const Service*> getServices();
     util::Map<std::string, const ComboPackage*> getComboPackages();

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

@@ -1,6 +1,8 @@
+#include <iomanip>
 #include "AdminMenu.h"
 #include "InputHelper.h"
 #include "OutputHelper.h"
+#include "Validator.h"
 
 void AdminMenu::showMenu()
 {
@@ -70,6 +72,37 @@ void AdminMenu::removeService()
 
 void AdminMenu::addTechnician()
 {
+	util::clear();
+	std::string username, password, email, phoneNumber;
+	std::cout << std::left << std::setw(25) << "Enter Technician Username:";
+	util::read(username);
+	std::cout << std::setw(25) << "Enter Technician Password:";
+	util::read(password);
+	if(!util::isPasswordValid(password))
+	{
+		std::cout << "Error: Password is invalid!";
+		util::pressEnter();
+		return;
+	}
+	std::cout << std::setw(25) << "Enter Technician Email:";
+	util::read(email);
+	if(!util::isEmailValid(email))
+	{
+		std::cout << "Error: Email is invalid!";
+		util::pressEnter();
+		return;
+	}
+	std::cout << std::setw(25) << "Enter Technician Phone:";
+	util::read(phoneNumber);
+	if(!util::isPhoneNumberValid(phoneNumber))
+	{
+		std::cout << "Error: Phone Number is invalid!";
+		util::pressEnter();
+		return;
+	}
+	m_controller.createTechnician(username, password, email, phoneNumber);
+	std::cout << "\nTechnician Added Successfully.\n";
+	util::pressEnter();
 }
 
 void AdminMenu::removeUser()