Refactor shortcode management to domain service

[CySSoO]

Summary

• extend the shortcode repository/provider with create, update, delete, and duplication helpers and introduce an EverBlockShortcodeDomainService for orchestration
• refactor the back-office controller, form data provider, tools, and PrettyBlocks integration to rely on the injected domain service/provider instead of the legacy ObjectModel
• wire the new services through the module container, drop the legacy model from autoload/config, and add repository tests for the new write operations

Testing

• php -l src/Repository/EverBlockShortcodeRepository.php
• php -l src/Service/EverBlockShortcodeProvider.php
• php -l src/Controller/Admin/EverblockShortcodeController.php
• php -l src/Service/EverblockPrettyBlocks.php

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https://chatgpt.com/codex/tasks/task_e_68f3a7580f248322aa6861fdc57d8df4