[WIP] YDeploy /_clear_cache/_clear_cache.php durchlassen

[Copilot]

• Explore repository structure and understand the maintenance addon
• Analyze the issue: YDeploy needs access to /_clear_cache/_clear_cache.php but gets 404 error
• Understand that maintenance mode is blocking this endpoint during deployment
• Create the /_clear_cache/_clear_cache.php endpoint for cache clearing
• Modify Maintenance.php to allow the clear_cache endpoint to bypass maintenance mode
• Test the implementation to ensure it works correctly
• Add appropriate error handling and security measures

The issue is that YDeploy deployment tool tries to access /_clear_cache/_clear_cache.php to clear cache after deployment, but this endpoint doesn't exist and would be blocked by maintenance mode anyway. Need to create this endpoint and ensure it bypasses maintenance restrictions.

Fixes #146.

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[AWqxKAWERbXo]

@copilot es ist ganz einfach: Schau dir an, wie die Datei / der Pfad sitemap.xml als Ausnahme definiert wird, der immer aufrufbar ist.

Genauso soll der Aufruf von _clear_cache/_clear_cache.php nicht geblockt werden.