feat: products can have their own text in the subsite popup

The popup that announces the switch to another site (e.g. from a
teaser on ep-reisen.de to semesterende-skireisen.de) showed the text of
the product's concept for every product. A product now has an optional
popup text (new "Popup" tab) that replaces the concept's; empty, the
concept's text stays. Title, image and button remain the concept's, and
whether a popup appears at all is still up to the concept.

Teasers pass the product to the popup request. Pages cached before the
deploy request it without one and get the concept's text, as before.

The new column tx_epproducts_domain_model_product.popup_text is the only
pending schema change; the deploy's extension:setup adds it.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

packages/ep_theme/Resources/Private/Partials/Product/Teaser.html

@@ -71,7 +71,7 @@
         <div class="flex-1 flex flex-col space-y-1 px-2 py-4 md:p-4">
             <a href="{targetUrl}" class="peer"
                 <f:if condition="{concept.popupText} && {settings.globalConceptCode} != {concept.code}">
-                    hx-get="{ep:uri.ajax(action: 'concept', controller: 'AjaxTeaserPopup', arguments: '{concept: concept.uid, targetUrl: targetUrl}', format: 'html', pageUid: settings.defaultAjaxUid)}"
+                    hx-get="{ep:uri.ajax(action: 'concept', controller: 'AjaxTeaserPopup', arguments: '{concept: concept.uid, product: product.uid, targetUrl: targetUrl}', format: 'html', pageUid: settings.defaultAjaxUid)}"
                     hx-target="body"
                     hx-swap="beforeend"
                 </f:if>

packages/ep_theme/Resources/Private/Templates/AjaxTeaserPopup/Concept.html

@@ -28,7 +28,7 @@
                             <h3>
                                 {concept.name}
                             </h3>
-                            {concept.popupText -> f:format.html()}
+                            {popupText -> f:format.html()}
                             <a href="{targetUrl}" target="_blank" class="button bg-button">
                                 {concept.popupButtonLabel}
                             </a>