feat: finish bilingual session auth learning lab

web/WEB-INF/classes/com/demo/action/UserAction.java

@@ -14,6 +14,7 @@ public class UserAction extends ActionSupport {
     private String phone;
     private String submittedAt;
     private String profileStage;
+    private boolean profileReady;
 
     public String submit() {
         username = normalize(username);
@@ -25,22 +26,23 @@ public class UserAction extends ActionSupport {
         }
 
         submittedAt = LocalDateTime.now().format(TIME_FORMATTER);
-        profileStage = (phone != null && phone.length() >= 7) ? "Profile ready for follow-up demos." : "Profile captured. Add a stronger phone number next time.";
+        profileReady = phone != null && phone.length() >= 7;
+        profileStage = profileReady ? "ready" : "review";
         return SUCCESS;
     }
 
     private boolean isValid() {
         boolean valid = true;
         if (username == null || username.length() < 3) {
-            addFieldError("username", "Username must be at least 3 characters.");
+            addFieldError("username", "用户名至少 3 个字符。 / Username must be at least 3 characters.");
             valid = false;
         }
         if (email == null || !email.contains("@")) {
-            addFieldError("email", "Enter a valid email address.");
+            addFieldError("email", "请输入有效邮箱。 / Enter a valid email address.");
             valid = false;
         }
         if (phone == null || phone.replaceAll("[^0-9]", "").length() < 7) {
-            addFieldError("phone", "Enter at least 7 digits for the phone number.");
+            addFieldError("phone", "手机号至少 7 位数字。 / Enter at least 7 digits for the phone number.");
             valid = false;
         }
         return valid;
@@ -81,4 +83,8 @@ public class UserAction extends ActionSupport {
     public String getProfileStage() {
         return profileStage;
     }
+
+    public boolean isProfileReady() {
+        return profileReady;
+    }
 }