fix(street): 晋升时重建副图父引用（草稿行 id 到 正式行 id）

internal/repository/street_main_detail_integration_test.go

@@ -159,3 +159,50 @@ func TestStreetMainDetailReparentGrandchildren(t *testing.T) {
 		}
 	}
 }
+
+// TestStreetPromoteRebuildsParentRef 晋升时必须把副图的父引用从「草稿行 id」改写为「新正式行 id」。
+func TestStreetPromoteRebuildsParentRef(t *testing.T) {
+	repo := NewReviewRepository(testDB(t))
+	ctx := context.Background()
+
+	draftID := seedStreetDraft(t, repo)
+	m1 := seedStreetDraftImage(t, repo, draftID, "main", 1)
+	d2 := seedStreetDraftImage(t, repo, draftID, "detail-a", 2)
+	d3 := seedStreetDraftImage(t, repo, draftID, "detail-b", 3)
+	if err := repo.AttachStreetDraftImages(ctx, draftID, m1, []uint32{d2, d3}); err != nil {
+		t.Fatalf("预置主副图失败: %v", err)
+	}
+
+	snapID, err := repo.SaveStreetSnapFromDraft(ctx, draftID)
+	if err != nil {
+		t.Fatalf("晋升失败: %v", err)
+	}
+	t.Cleanup(func() {
+		db := repo.(*reviewRepository).db
+		db.Exec("DELETE FROM street_snap_images WHERE snap_id = ?", snapID)
+		db.Exec("DELETE FROM street_snaps WHERE id = ?", snapID)
+	})
+
+	db := repo.(*reviewRepository).db
+	var rows []model.StreetSnapImage
+	if err := db.WithContext(ctx).Where("snap_id = ? AND is_deleted = 0", snapID).
+		Order("sort_order ASC, id ASC").Find(&rows).Error; err != nil {
+		t.Fatalf("读正式图失败: %v", err)
+	}
+	if len(rows) != 3 {
+		t.Fatalf("期望 3 行正式图，实际 %d", len(rows))
+	}
+
+	mainRow := rows[0]
+	if mainRow.IsDetail != 0 || mainRow.ParentImageID != 0 {
+		t.Fatalf("首行应是主图，实际 is_detail=%d parent=%d", mainRow.IsDetail, mainRow.ParentImageID)
+	}
+	for _, row := range rows[1:] {
+		if row.IsDetail != 1 {
+			t.Fatalf("第 %d 行应是副图", row.ID)
+		}
+		if row.ParentImageID != mainRow.ID {
+			t.Fatalf("副图 parent 应指向新主图行 id %d，实际 %d", mainRow.ID, row.ParentImageID)
+		}
+	}
+}