feat(#5): Add title-body control element that can be added dynamically, refactored sectionIndex/create

CHANGELOG.md

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+# Changelog
+
+## 2025-11-02 - Form Element Management API
+
+- New input field with title and text needed to be added to application forms
+- Adding new form elements to existing application forms caused type conflicts: frontend needed to add `CreateFormElementDto` (without ID) to arrays of `FormElementDto` (with ID)
+- Implemented separate endpoint for adding form elements: `POST /application-forms/{applicationFormId}/sections/{sectionId}/form-elements`
+