Improve config folder structure and add caching

[giuscris]

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[Copilot]

Pull Request Overview

This PR centralizes and optimizes configuration loading by introducing caching, removing legacy default layers, and standardizing how defaults are accessed in controllers.

• Adds a host-scoped cache layer in ConfigServiceLoader to speed up repeated bootstraps.
• Removes the old “defaults” mechanism from Config, consolidating onto a single config array and throwing on load errors.
• Refactors panel/site controllers to use a new defaultConfig() helper instead of removed defaults() methods and updates routing/methods paths.

Reviewed Changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
formwork/src/Services/Loaders/ConfigServiceLoader.php	Implements file-based caching for resolved configs, per host
formwork/src/Panel/Controllers/OptionsController.php	Replaces app->defaults()/site->defaults() with defaultConfig()
formwork/src/Config/Exceptions/ConfigLoadingException.php	Introduces exception for missing/unsupported config files
formwork/src/Config/Config.php	Drops separate defaults storage, adds load-file error handling
formwork/src/Cms/Site.php	Removes legacy defaults merge, renames alias loader to setRouteAliases
formwork/src/Cms/App.php	Adjusts DI definitions order and view-methods path resolution
formwork/config/system.yaml	Updates routes and views.methods file paths

Comments suppressed due to low confidence (1)

formwork/src/Cms/Site.php:459

• You renamed loadRouteAliases() to setRouteAliases(array $aliases), but removed its invocation in load(). To restore route aliases setup, call $this->setRouteAliases($this->data['routeAliases']) (e.g. right after populating $this->data).

$this->fields->setModel($this);