refactor: 未使用フィールドの削除と関数名の改善

- WorkUpdatedAt フィールドを削除（ORDER BYのみで使用、API応答には不要）
- aggregateWorkListRows → mapRowsToWorkList に名称変更
- aggregateWorkDetailRows → mapRowsToWorkDetail に名称変更

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: newt239

pkg/db/sql/work/select_work_with_relations.sql

@@ -1,7 +1,6 @@
-SELECT 
+SELECT
     BIN_TO_UUID(works.id) AS work_id,
     works.name AS work_name,
-    works.updated_at AS work_updated_at,
     BIN_TO_UUID(work_users.user_id) AS author_user_id,
     user_profiles.username AS author_username,
     user_profiles.icon_url AS author_icon_url,

pkg/work/get_user_user_id_work.go

@@ -52,5 +52,5 @@ func getWorkListFromAuthorId(dbClient db.Client, userId string) ([]workOverview,
 		}
 	}
 
-	return aggregateWorkListRows(rows), nil
+	return mapRowsToWorkList(rows), nil
 }

pkg/work/get_work_work.go

@@ -13,7 +13,6 @@ import (
 type workWithRelationsRow struct {
 	WorkId         string  `db:"work_id"`
 	WorkName       string  `db:"work_name"`
-	WorkUpdatedAt  string  `db:"work_updated_at"`
 	AuthorUserId   *string `db:"author_user_id"`
 	AuthorUsername *string `db:"author_username"`
 	AuthorIconUrl  *string `db:"author_icon_url"`
@@ -57,10 +56,10 @@ func getWorkList(dbClient db.Client, offset *int, authorId *string) ([]workOverv
 	if err != nil {
 		return []workOverview{}, &response.Error{Code: http.StatusInternalServerError, Level: "Error", Message: "不明なエラーが発生しました", Log: err.Error()}
 	}
-	return aggregateWorkListRows(rows), nil
+	return mapRowsToWorkList(rows), nil
 }
 
-func aggregateWorkListRows(rows []workWithRelationsRow) []workOverview {
+func mapRowsToWorkList(rows []workWithRelationsRow) []workOverview {
 	workMap := make(map[string]*workOverview)
 	workOrder := make([]string, 0)
 	authorMap := make(map[string]map[string]bool)

pkg/work/get_work_work_work_id.go

@@ -84,10 +84,10 @@ func getWorkFromTagId(dbClient db.Client, workId string) (work, *response.Error)
 	if len(rows) == 0 {
 		return work{}, &response.Error{Code: http.StatusNotFound, Level: "Info", Message: "作品が存在しません", Log: "no rows in result"}
 	}
-	return aggregateWorkDetailRows(rows), nil
+	return mapRowsToWorkDetail(rows), nil
 }
 
-func aggregateWorkDetailRows(rows []workDetailWithRelationsRow) work {
+func mapRowsToWorkDetail(rows []workDetailWithRelationsRow) work {
 	firstRow := rows[0]
 	result := work{
 		WorkId:      firstRow.WorkId,