add templates media_links.html and media_detail.html for kontor-gin

kontor-gin/internal/api/file.go

@@ -15,7 +15,21 @@ func WriteJson(data *ExportData, fileName string) error {
 	// Write bytes to file
 	err = os.WriteFile(fileName, jsonData, 0644)
 	if err != nil {
-		slog.Info("Error writing file:", "Error", err)
+		slog.Info("Error writing file:", "Error", err.Error())
+		return err
+	}
+	return nil
+}
+
+func ReadJson(data *ExportData, fileName string) error {
+	content, err := os.ReadFile(fileName)
+	if err != nil {
+		slog.Info("Error reading file", "Error", err.Error())
+		return err
+	}
+
+	if err := json.Unmarshal(content, data); err != nil {
+		slog.Info("Error unmarshal json", "Error", err.Error())
 		return err
 	}
 	return nil