feat: get news by slug and and author detail

internal/accessor/news/get_by_slug.go

@@ -0,0 +1,17 @@
+package newsrepository
+
+import newsdomain "legalgo-BE-go/internal/domain/news"
+
+func (a *accessor) GetBySlug(slug string) (*newsdomain.News, error) {
+	var news newsdomain.News
+
+	if err := a.db.
+		Preload("Tags").
+		Preload("Categories").
+		Preload("Author").
+		First(&news, "slug = ?", slug).Error; err != nil {
+		return nil, err
+	}
+
+	return &news, nil
+}