Test admin register request notification handling

backend/src/main/java/com/openisle/controller/AdminUserController.java

@@ -1,7 +1,10 @@
 package com.openisle.controller;
 
+import com.openisle.model.Notification;
+import com.openisle.model.NotificationType;
 import com.openisle.model.User;
 import com.openisle.service.EmailSender;
+import com.openisle.repository.NotificationRepository;
 import com.openisle.repository.UserRepository;
 import lombok.RequiredArgsConstructor;
 import org.springframework.beans.factory.annotation.Value;
@@ -13,6 +16,7 @@ import org.springframework.web.bind.annotation.*;
 @RequiredArgsConstructor
 public class AdminUserController {
     private final UserRepository userRepository;
+    private final NotificationRepository notificationRepository;
     private final EmailSender emailSender;
     @Value("${app.website-url:https://www.open-isle.com}")
     private String websiteUrl;
@@ -22,6 +26,7 @@ public class AdminUserController {
         User user = userRepository.findById(id).orElseThrow();
         user.setApproved(true);
         userRepository.save(user);
+        markRegisterRequestNotificationsRead(user);
         emailSender.sendEmail(user.getEmail(), "您的注册已审核通过",
                 "🎉您的注册已经审核通过, 点击以访问网站: " + websiteUrl);
         return ResponseEntity.ok().build();
@@ -32,8 +37,18 @@ public class AdminUserController {
         User user = userRepository.findById(id).orElseThrow();
         user.setApproved(false);
         userRepository.save(user);
+        markRegisterRequestNotificationsRead(user);
         emailSender.sendEmail(user.getEmail(), "您的注册已被管理员拒绝",
                 "您的注册被管理员拒绝, 点击链接可以重新填写理由申请: " + websiteUrl);
         return ResponseEntity.ok().build();
     }
+
+    private void markRegisterRequestNotificationsRead(User applicant) {
+        java.util.List<Notification> notifs =
+                notificationRepository.findByTypeAndFromUser(NotificationType.REGISTER_REQUEST, applicant);
+        for (Notification n : notifs) {
+            n.setRead(true);
+        }
+        notificationRepository.saveAll(notifs);
+    }
 }