Add survey question drag-sort and backend assets

- Frontend editor: drag-to-sort questions with dedicated sort assets/JS
- Backend list/search refinements for tl_survey and tl_survey_content
- Repository helpers for survey/question/editor queries
- Translations and AI handover notes update

translations/messages.de.yaml

@@ -80,6 +80,8 @@ survey:
     delete: "Löschen"
     no_questions: "Noch keine Fragen angelegt."
     new_question: "Neue Frage anlegen"
+    reorder_question: "Frage verschieben"
+    save_question_order: "Neue Reihenfolge speichern"
     open_question: "Akkordeon öffnen"
     close_question: "Akkordeon schließen"
     conditions_title: "Sprungregeln"

translations/messages.en.yaml

@@ -80,6 +80,8 @@ survey:
     delete: "Delete"
     no_questions: "No questions created yet."
     new_question: "Create new question"
+    reorder_question: "Reorder question"
+    save_question_order: "Save new order"
     open_question: "Open accordion"
     close_question: "Close accordion"
     conditions_title: "Jump rules"