Replace _random archive ID variants with V3 canonical field names

archive_obj.archive_id_random → .archive_id in load function and post-create
assignment; remove archive_id_random and hosted_file_id_random from editable
fields list — V3 returns the random string as the primary ID field directly.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/lib/ae_archives/ae_archives__archive_content.editable_fields.ts

@@ -1,6 +1,5 @@
 export const editable_fields__archive_content = [
     'archive_id',
-    'archive_id_random',
     'archive_content_type',
     'name',
     'description',
@@ -9,7 +8,6 @@ export const editable_fields__archive_content = [
     'url',
     'url_text',
     'hosted_file_id',
-    'hosted_file_id_random',
     'file_path',
     'filename',
     'file_extension',