chore(ci, dto): update build workflow and enhance post DTOs

- Added NODE_NO_WARNINGS environment variable to build and deploy workflows.
- Upgraded actions/upload-artifact and actions/download-artifact to version 4 in the build workflow.
- Introduced ContentEditedAt field in PostResponse and PostDetailResponse DTOs to track content modification timestamps.
- Updated post conversion functions to include ContentEditedAt in responses.
- Ensured ContentEditedAt is set during post updates in the repository.

internal/repository/comment_repo.go

@@ -73,6 +73,7 @@ func (r *CommentRepository) Delete(id string) error {
 				UpdateColumns(map[string]interface{}{
 					"comments_count": gorm.Expr("comments_count - 1"),
 					"hot_score":      gorm.Expr("likes_count * 2 + (comments_count - 1) * 3 + views_count * 0.1"),
+					"updated_at":     gorm.Expr("updated_at"),
 				}).Error; err != nil {
 				return err
 			}
@@ -102,6 +103,7 @@ func (r *CommentRepository) ApplyPublishedStats(comment *model.Comment) error {
 			UpdateColumns(map[string]any{
 				"comments_count": gorm.Expr("comments_count + 1"),
 				"hot_score":      gorm.Expr("likes_count * 2 + (comments_count + 1) * 3 + views_count * 0.1"),
+				"updated_at":     gorm.Expr("updated_at"),
 			}).Error; err != nil {
 			return err
 		}