Update controller methods and fix const issues

Changes:
- Added stub implementations for Controller.cpp methods
- Fixed const issue in UserInterface methods (run, login, registerCustomer, handleOperation)
- Changed return types to use const pointers for read-only objects
- Updated maps and vectors to return const object pointers
- Fixed some function parameter names and signatures for consistency

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

@@ -1 +1,139 @@
 #include "Controller.h"
+
+bool Controller::login(const std::string& username, const std::string& password)
+{
+    return false;
+}
+
+void Controller::logout()
+{
+}
+
+void Controller::changePassword(const std::string& newPassword)
+{
+}
+
+void Controller::createCustomer(const std::string& username, const std::string& password, const std::string& email, const std::string& phone)
+{
+}
+
+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::updateUserDetails(const std::string& email, const std::string& phone)
+{
+}
+
+util::Map<std::string, const Service*> Controller::getServices()
+{
+}
+
+util::Map<std::string, const ComboPackage*> Controller::getComboPackages()
+{
+}
+
+void Controller::purchaseService(const util::Vector<std::string>& serviceIDs, const std::string& vehicleNumber, const std::string& vehicleBrand, const std::string& vehicleModel)
+{
+}
+
+void Controller::purchaseComboPackage(const std::string& comboPackageID, const std::string& vehicleNumber, const std::string& vehicleBrand, const std::string& vehicleModel)
+{
+}
+
+util::Map<std::string, const InventoryItem*> Controller::getInventoryItems()
+{
+}
+
+const InventoryItem* Controller::getInventoryItem(const std::string& inventoryItemID)
+{
+    return nullptr;
+}
+
+void Controller::addInventoryItem(const std::string& partName, int quantity, double price)
+{
+}
+
+void Controller::removeInventoryItem(const std::string& inventoryItemID)
+{
+}
+
+util::Map<std::string, const ServiceBooking*> Controller::getServiceBookings()
+{
+}
+
+util::Map<std::string, const ServiceBooking*> Controller::getServiceBookingsByUser(const std::string userID)
+{
+}
+
+util::Map<std::string, const User*> Controller::getUsers()
+{
+}
+
+util::Map<std::string, const User*> Controller::getUsers(util::UserType userType)
+{
+}
+
+void Controller::createJobCard(const std::string& bookingID, const std::string& technicianID, const std::string& serviceID)
+{
+}
+
+void Controller::createService(const std::string& name, const util::Vector<std::string>& inventoryItemIDs, double laborCost)
+{
+}
+
+void Controller::removeService(const std::string& serviceID)
+{
+}
+
+util::Map<std::string, const JobCard*> Controller::getJobCardsByUser()
+{
+    return util::Map<std::string, const JobCard*>();
+}
+
+void Controller::completeJob(const std::string& jobID)
+{
+}
+
+void Controller::removeUser(const std::string& userID)
+{
+}
+
+void Controller::createComboPackage(const std::string& name, const util::Vector<std::string>& serviceIDs, double discountPercentage)
+{
+}
+
+void Controller::removeComboPackage(const std::string& comboPackageID)
+{
+}
+
+util::Map<std::string, const Invoice*> Controller::getInvoicesByUser()
+{
+    return util::Map<std::string, const Invoice*>();
+}
+
+void Controller::completePayment(const std::string& invoiceID, util::PaymentMode paymentMode)
+{
+}
+
+util::Vector<const Notification*> Controller::getNotifications()
+{
+}
+
+void Controller::deleteNotification(const std::string& notificationID)
+{
+}
+
+void Controller::configureNotifications(const std::string& userID, bool paymentNotifications, bool serviceNotifications)
+{
+}
+
+void Controller::runSystemChecks()
+{
+}
+