Align the Thelia 3 skills on 3.0.0-beta3

[anoziere]

Updates the plugin skills to match Thelia 3 as released in 3.0.0-beta3, and corrects the statements that the release made false.

Corrected

• Flexy assets: Webpack Encore, package.json and npm run build are gone. The theme runs on AssetMapper (importmap.php) and a standalone Tailwind v4 CLI binary.
• Flexy structure: src/UiComponents/ became components/ (PSR-4 FlexyBundle\Components\). The @components, @UiComponents, @assets and @formTwig Twig namespaces became @Flexy and @FlexyForm. The TwigComponent name prefix is empty, so component attributes are written bare — every #[AsLiveComponent(name: 'Flexy:...')] example was wrong.
• thelia/front-module: no longer a dependency. The theme owns the catch-all /{_view} route through FlexyBundle\Controller\ViewController, which delegates to DefaultController::noAction.
• Form themes: neither theme registers globally any more. The back-office rationale ("the Flexy theme wins the global lookup") no longer held; a form with no form_theme tag now falls back to bare Symfony markup.
• Versions: 3.0.0-beta1 replaced throughout, including THELIA_VERSION. Records that the skeleton and each template move on their own version track.
• PHP: 8.3 and 8.4, not 8.3 alone.
• Dropped the "Encore -> Vite" evolution note, now moot.

Added

• A missing GitHub token fails an install on an unrelated message. Flex silently falls back to auto-generated recipes, never writes Thelia's config/packages/*.yaml, and the install dies far downstream on You must either configure a "public_key" or a "secret_key".
• LiveComponents 404 without ignore_thelia_view: true on /_components. The recipe sets it, but Flex does not rewrite an existing routing file, so upgraded projects keep the old one.
• Front assets are automatic, back-office assets are not. bin/install runs importmap:install then tailwind:build; the back-office dist/ is gitignored and still needs npm install && npm run build.
• config/views.yaml and InternalViewsDeclaration: how a theme declares root templates that are not pages.
• CustomerPersonalDataProviderInterface for adding a section to the customer data export, and the rate-limited CustomerCodeManager::requestCode().
• provide() / inject() on PHP 8.3, supplied by the theme's ComponentContextExtension because ux-twig-component resolves to 2.x there.
• The virtual product download route and its event.

Neutrality check passes. Plugin bumped 0.3.0 -> 0.4.0.