feat(plugins): Support self-contained plugin directories

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- PluginManager now recursively scans app/Plugins/ to discover plugins
- Supports both single-file plugins (MyPlugin.php) and directory plugins (MyPlugin/MyPlugin.php)
- Plugins can contain their own Models, Controllers, Views, Libraries, Helpers
- Uses PSR-4 namespacing: App\Plugins\PluginName for files, App\Plugins\PluginName\Subdir for subdirectories
- Users can install plugins by simply dropping a folder into app/Plugins/
- Updated README with comprehensive documentation on both plugin formats

This makes plugin installation much easier - just drop the plugin folder and it works.

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