chore: copy ep_products and ep_theme from EP/website@9593cc8

Copied unchanged from public/typo3conf/ext/ of EP/website at
9593cc8631354f8a363d6609de8b7433f669a9a0 (Git-tracked files only).
History stays in the old repository. Only composer.json files are
added so the extensions install as path packages.

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

packages/ep_theme/Configuration/TypoScript/ContentElements/button.typoscript

@@ -0,0 +1,8 @@
+tt_content.button =< lib.contentElement
+tt_content.button {
+    templateName = Button
+    variables {
+        referrerPid = TEXT
+        referrerPid.data = TSFE:id
+    }
+}