Align desktop user contract with backend

- Replace firstName and lastName with fullName and email in UserRequest
- Add email and updatedAt to UserResponse
- Update StaffRegisterDialogController to build fullName from firstName + lastName
- Update StaffRegisterDialogController to include email validation and send email
- Update StaffAccountsController to use backend email from UserResponse instead of hardcoding blank

src/main/java/org/example/petshopdesktop/api/dto/user/UserRequest.java

@@ -3,8 +3,8 @@ package org.example.petshopdesktop.api.dto.user;
 public class UserRequest {
     private String username;
     private String password;
-    private String firstName;
+    private String fullName;
-    private String lastName;
+    private String email;
     private String role;
     private Boolean active;
 
@@ -27,20 +27,20 @@ public class UserRequest {
         this.password = password;
     }
 
-    public String getFirstName() {
+    public String getFullName() {
-        return firstName;
+        return fullName;
     }
 
-    public void setFirstName(String firstName) {
+    public void setFullName(String fullName) {
-        this.firstName = firstName;
+        this.fullName = fullName;
     }
 
-    public String getLastName() {
+    public String getEmail() {
-        return lastName;
+        return email;
     }
 
-    public void setLastName(String lastName) {
+    public void setEmail(String email) {
-        this.lastName = lastName;
+        this.email = email;
     }
 
     public String getRole() {

src/main/java/org/example/petshopdesktop/api/dto/user/UserResponse.java

@@ -6,9 +6,11 @@ public class UserResponse {
     private Long id;
     private String username;
     private String fullName;
+    private String email;
     private String role;
     private Boolean active;
     private LocalDateTime createdAt;
+    private LocalDateTime updatedAt;
 
     public UserResponse() {
     }
@@ -37,6 +39,14 @@ public class UserResponse {
         this.fullName = fullName;
     }
 
+    public String getEmail() {
+        return email;
+    }
+
+    public void setEmail(String email) {
+        this.email = email;
+    }
+
     public String getRole() {
         return role;
     }
@@ -60,4 +70,12 @@ public class UserResponse {
     public void setCreatedAt(LocalDateTime createdAt) {
         this.createdAt = createdAt;
     }
+
+    public LocalDateTime getUpdatedAt() {
+        return updatedAt;
+    }
+
+    public void setUpdatedAt(LocalDateTime updatedAt) {
+        this.updatedAt = updatedAt;
+    }
 }

src/main/java/org/example/petshopdesktop/controllers/StaffAccountsController.java

@@ -142,7 +142,7 @@ public class StaffAccountsController {
         String[] names = splitFullName(fullName);
         String firstName = names[0];
         String lastName = names[1];
-        String email = "";
+        String email = user.getEmail() != null ? user.getEmail() : "";
         String phone = "";
         boolean active = user.getActive() != null ? user.getActive() : false;
         Timestamp createdAt = user.getCreatedAt() != null

src/main/java/org/example/petshopdesktop/controllers/dialogcontrollers/StaffRegisterDialogController.java

@@ -48,6 +48,7 @@ public class StaffRegisterDialogController {
 
         String firstName = value(txtFirstName);
         String lastName = value(txtLastName);
+        String email = value(txtEmail);
         String username = value(txtUsername);
         String password = txtPassword.getText() == null ? "" : txtPassword.getText();
         String confirm = txtPasswordConfirm.getText() == null ? "" : txtPasswordConfirm.getText();
@@ -56,6 +57,10 @@ public class StaffRegisterDialogController {
             lblError.setText("First name and last name are required.");
             return;
         }
+        if (email.isBlank()) {
+            lblError.setText("Email is required.");
+            return;
+        }
         if (username.isBlank()) {
             lblError.setText("Username is required.");
             return;
@@ -76,8 +81,8 @@ public class StaffRegisterDialogController {
                 UserRequest request = new UserRequest();
                 request.setUsername(username);
                 request.setPassword(password);
-                request.setFirstName(firstName);
+                request.setFullName(firstName + " " + lastName);
-                request.setLastName(lastName);
+                request.setEmail(email);
                 request.setRole("STAFF");
                 request.setActive(true);