[FEATURE] 강사 시안 수정 요청시 메일 알림 이벤트 추가

src/main/java/ditda/backend/domain/commission/core/event/RevisionRequestedEvent.java

@@ -0,0 +1,13 @@
+package ditda.backend.domain.commission.core.event;
+
+import java.time.LocalDateTime;
+
+public record RevisionRequestedEvent(
+	Long commissionId,
+	String commissionTitle,
+	String designerEmail,
+	String designerName,
+	int currentRevisionCount,
+	LocalDateTime mailScheduledAt
+) {
+}

src/main/java/ditda/backend/domain/commission/core/notification/RevisionRequestedNotifier.java

@@ -0,0 +1,45 @@
+package ditda.backend.domain.commission.core.notification;
+
+import java.time.LocalDateTime;
+import java.util.Map;
+
+import org.springframework.context.event.EventListener;
+import org.springframework.stereotype.Component;
+
+import ditda.backend.domain.commission.core.event.RevisionRequestedEvent;
+import ditda.backend.global.email.NotificationOutbox;
+import ditda.backend.global.email.NotificationOutboxRepository;
+import lombok.RequiredArgsConstructor;
+
+@Component
+@RequiredArgsConstructor
+public class RevisionRequestedNotifier {
+
+	private final NotificationOutboxRepository outboxRepository;
+
+	@EventListener
+	public void onRevisionRequested(RevisionRequestedEvent event) {
+
+		// 메일 전송 시간
+		LocalDateTime mailScheduledAt = event.mailScheduledAt();
+
+		registerDesignerRevisionRequested(event, mailScheduledAt);
+	}
+
+	private void registerDesignerRevisionRequested(
+		RevisionRequestedEvent event,
+		LocalDateTime mailScheduledAt
+	) {
+		outboxRepository.save(NotificationOutbox.create(
+			event.designerEmail(),
+			"[DITDA] 시안 수정 요청이 도착했습니다. 확인해주세요.",
+			"email/revision-requested-designer",
+			Map.of(
+				"designerName", event.designerName(),
+				"commissionTitle", event.commissionTitle(),
+				"currentRevisionCount", event.currentRevisionCount()
+			),
+			mailScheduledAt
+		));
+	}
+}

src/main/java/ditda/backend/domain/commission/core/service/InstructorCommissionService.java

@@ -111,6 +111,19 @@ public Commission getOwnedCommission(Long commissionId, Long instructorId) {
 		return commission;
 	}
 
+	// 외주 조회(instructor/designer fetch) + 강사 확인
+	@Transactional(readOnly = true)
+	public Commission getOwnedCommissionWithInstructorAndAssignedDesigner(Long commissionId, Long instructorId) {
+
+		Commission commission = commissionRepository.findWithInstructorAndAssignedDesignerById(commissionId)
+			.orElseThrow(() -> new GeneralException(CommissionErrorCode.COMMISSION_NOT_FOUND));
+
+		if (!commission.isOwnedBy(instructorId)) {
+			throw new GeneralException(CommissionErrorCode.COMMISSION_ACCESS_DENIED);
+		}
+		return commission;
+	}
+
 	// 디자이너 선택
 	@Transactional
 	public void selectDesigner(Commission commission, Designer designer, LocalDateTime now) {

src/main/java/ditda/backend/domain/commission/revision/facade/InstructorRevisionFacade.java

@@ -1,9 +1,14 @@
 package ditda.backend.domain.commission.revision.facade;
 
+import java.time.LocalDateTime;
+import java.time.ZoneId;
+
+import org.springframework.context.ApplicationEventPublisher;
 import org.springframework.stereotype.Component;
 import org.springframework.transaction.annotation.Transactional;
 
 import ditda.backend.domain.commission.core.entity.Commission;
+import ditda.backend.domain.commission.core.event.RevisionRequestedEvent;
 import ditda.backend.domain.commission.core.service.InstructorCommissionService;
 import ditda.backend.domain.commission.draft.entity.CommissionDraft;
 import ditda.backend.domain.commission.draft.entity.CommissionDraftFile;
@@ -14,6 +19,7 @@
 import ditda.backend.domain.commission.revision.mapper.RevisionMapper;
 import ditda.backend.domain.commission.revision.service.InstructorRevisionService;
 import ditda.backend.domain.commission.revision.service.RevisionQueryService;
+import ditda.backend.domain.user.entity.User;
 import ditda.backend.global.apipayload.exception.GeneralException;
 import lombok.RequiredArgsConstructor;
 
@@ -22,11 +28,14 @@
 @Transactional(readOnly = true)
 public class InstructorRevisionFacade {
 
+	private static final ZoneId ZONE_KST = ZoneId.of("Asia/Seoul");
+
 	private final InstructorCommissionService instructorCommissionService;
 	private final RevisionQueryService revisionQueryService;
 	private final InstructorRevisionService instructorRevisionService;
 	private final DraftQueryService draftQueryService;
 	private final RevisionMapper revisionMapper;
+	private final ApplicationEventPublisher eventPublisher;
 
 	@Transactional
 	public InstructorRevisionDetailResponse getRevisionDetail(Long instructorId, Long commissionId) {
@@ -62,7 +71,8 @@ public InstructorRevisionDetailResponse getRevisionDetail(Long instructorId, Lon
 	public void createRevision(Long instructorId, Long commissionId, RevisionCreateRequest request) {
 
 		// 외주 조회 + 강사 확인
-		Commission commission = instructorCommissionService.getOwnedCommission(commissionId, instructorId);
+		Commission commission =
+			instructorCommissionService.getOwnedCommissionWithInstructorAndAssignedDesigner(commissionId, instructorId);
 
 		// 수정 단계인지 검증
 		commission.validateRevisable();
@@ -86,6 +96,12 @@ public void createRevision(Long instructorId, Long commissionId, RevisionCreateR
 
 		// 수정 요청 저장
 		instructorRevisionService.createRevisionRequest(commission, latestDraft, request);
+
+		// 생성된 수정 요청을 반영한 수정 횟수
+		int currentRevisionCount = current + 1;
+
+		// 디자이너에게 수정 요청 도착 메일 발송
+		publishRevisionRequestedEvent(commission, currentRevisionCount);
 	}
 
 	// 카테고리 중복 검증
@@ -100,4 +116,19 @@ private void validateDistinctCategories(RevisionCreateRequest request) {
 			throw new GeneralException(RevisionErrorCode.DUPLICATE_REVISION_CATEGORY);
 		}
 	}
+
+	// 수정 요청 알림 이벤트 발행
+	private void publishRevisionRequestedEvent(Commission commission, int currentRevisionCount) {
+
+		User designerUser = commission.getAssignedDesigner().getUser();
+
+		eventPublisher.publishEvent(new RevisionRequestedEvent(
+			commission.getId(),
+			commission.getTitle(),
+			designerUser.getEmail(),
+			designerUser.getName(),
+			currentRevisionCount,
+			LocalDateTime.now(ZONE_KST)
+		));
+	}
 }

src/main/resources/templates/email/revision-requested-designer.html

@@ -0,0 +1,49 @@
+<!DOCTYPE html>
+<html xmlns:th="http://www.thymeleaf.org">
+<head>
+    <meta charset="UTF-8">
+</head>
+<body>
+<div style="font-family: 'Apple SD Gothic Neo', sans-serif; max-width: 480px; margin: 0 auto; padding: 24px;">
+
+    <div style="text-align: center; margin-bottom: 24px;">
+        <img alt="ditda" src="cid:logoImage" style="height: 48px;">
+    </div>
+
+    <div style="text-align: center;">
+        <h2 style="color: #874fff;">시안 수정 요청 안내</h2>
+        <p style="color: #222; font-weight: 600; font-size: 16px;" th:text="${designerName} + ' 디자이너님'"></p>
+        <p style="color: #666; line-height: 1.6;">
+            강사님으로부터 <strong style="color: #874fff;">시안 수정 요청</strong>이 도착했습니다.<br>
+            요청 내용을 확인하시고 가능한 빠르게 수정본을 제출해 주세요.
+        </p>
+    </div>
+
+    <div style="margin-top: 24px; padding: 16px 20px; background: #f5f5f7; border-radius: 8px;">
+        <div style="margin: 8px 0;">
+            <span style="display: inline-block; width: 130px; color: #888; font-size: 14px;">외주명</span>
+            <span style="font-weight: 600;" th:text="${commissionTitle}"></span>
+        </div>
+        <div style="margin: 8px 0;">
+            <span style="display: inline-block; width: 130px; color: #888; font-size: 14px;">수정 차수</span>
+            <span style="font-weight: 600; color: #874fff;" th:text="${currentRevisionCount} + '차'"></span>
+        </div>
+    </div>
+
+    <div style="margin-top: 24px; text-align: center;">
+        <a href="https://ditda.kr/designer"
+           style="display: inline-block; padding: 12px 24px; background: #874fff; color: #fff; text-decoration: none; border-radius: 8px; font-weight: bold; font-size: 14px;">
+            수정 요청 확인하기
+        </a>
+    </div>
+
+    <p style="margin-top: 24px; color: #666; font-size: 14px; line-height: 1.6; text-align: center;">
+        제출이 지연되면 <strong style="color: #874fff;">남은 수정 기회</strong>에 영향을 줄 수 있으니 신속히 진행해 주세요.
+    </p>
+
+    <p style="color: #999; margin-top: 32px; font-size: 12px; text-align: center; border-top: 1px solid #eee; padding-top: 16px;">
+        본 메일은 발신 전용입니다.
+    </p>
+</div>
+</body>
+</html>