feat: add support for attachments in template management

- Enhanced TemplateEditForm to include attachments in the template data.
- Updated createDocumentFromTemplate to handle attachment creation.
- Modified updateTemplate to manage attachment updates and deletions.
- Integrated attachments into ZTemplateSchema and ZAddTemplateSettingsFormSchema for validation.
- Improved getTemplateById to fetch attachments alongside other template data.

packages/lib/server-only/template/get-template-by-id.ts

@@ -34,6 +34,7 @@ export const getTemplateById = async ({ id, userId, teamId }: GetTemplateByIdOpt
       templateMeta: true,
       recipients: true,
       fields: true,
+      attachments: true,
       user: {
         select: {
           id: true,