fix(files_external): set size to -1 for root entry

[salmart-dev]

• Resolves: #

Summary

Sets the fake root folder's size to -1 so it gets scanned by the scanner. Before the changes below, scanning happened because there would be no cache entry for the directory, which triggered the first scan. Since with the newer changes a fake root is created with size 0, this does no longer happen.

server/apps/files_external/lib/Service/MountCacheService.php

Lines 117 to 134 in d8e8703

	// create a "fake" root entry so we have a fileid so we don't have to interact with the remote service
	// this will be scanned on first access
	$data = [
	'path' => '',
	'path_hash' => md5(''),
	'size' => 0,
	'unencrypted_size' => 0,
	'mtime' => 0,
	'mimetype' => ICacheEntry::DIRECTORY_MIMETYPE,
	'parent' => -1,
	'name' => '',
	'storage_mtime' => 0,
	'permissions' => 31,
	'storage' => $cache->getNumericStorageId(),
	'etag' => '',
	'encrypted' => 0,
	'checksum' => '',
	];

TODO

• [ ]

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)
• Labels added where applicable (ex: bug/enhancement, 3. to review, feature component)
• Milestone added for target branch/version (ex: 32.x for stable32)

AI (if applicable)

• The content of this PR was partly or fully generated using AI