Merge branch 'k-kobayashi' of https://gitea.it-college.co.jp/2026_09_5H_Spring_KIZAKI/Monegement into n-kawahito

# Conflicts:
#	src/main/java/com/example/demo/app/domain/service/CourseInfoService.java
#	src/main/java/com/example/demo/app/domain/service/CourseService.java

src/main/resources/templates/Authentication.html

@@ -0,0 +1,53 @@
+<!DOCTYPE html>
+<html xmlns:th="http://www.thymeleaf.org">
+
+<head>
+	<meta charset="UTF-8">
+	<title>認証</title>
+</head>
+
+<body>
+	<main>
+		<h1>本人認証確認</h1>
+	
+		<form th:action="@{/authentication}" th:object="${authenticationForm}" method="post">
+	
+			<div>
+				<label for="mailAddress">メールアドレス</label>
+				<input type="email" id="mailAddress" th:field="*{mailAddress}">
+			</div>
+	
+			<div>
+				<label for="secretQuestionId">秘密の質問</label>
+				<select id="secretQuestionId" th:field="*{secretQuestionId}">
+	
+					<option value="">選択してください</option>
+	
+					<option th:each="question : ${questionList}" th:value="${question.secretQuestionId}"
+						th:text="${question.questionText}">
+					</option>
+	
+				</select>
+			</div>
+	
+			<div>
+				<label for="secretAnswer">秘密の質問の回答</label>
+				<input type="text" id="secretAnswer" th:field="*{secretAnswer}">
+			</div>
+	
+			<button type="submit">確認</button>
+	
+		</form>
+		
+		<form th:action="@{/login}" method="get">
+			<button type="submit">戻る</button>
+		</form>
+	</main>
+	
+	<script th:if="${errorMessage}" th:inline="javascript">
+	    alert(/*[[${errorMessage}]]*/);
+	</script>
+	
+</body>
+
+</html>