fix: Add @OrderColumn to formElements to keep insertion order

legalconsenthub-backend/src/main/kotlin/com/betriebsratkanzlei/legalconsenthub/form_element/FormElementSection.kt

@@ -9,6 +9,7 @@ import jakarta.persistence.Id
 import jakarta.persistence.JoinColumn
 import jakarta.persistence.ManyToOne
 import jakarta.persistence.OneToMany
+import jakarta.persistence.OrderColumn
 import java.util.UUID
 
 @Entity
@@ -21,6 +22,7 @@ class FormElementSection(
     var shortTitle: String? = null,
     var description: String? = null,
     @OneToMany(mappedBy = "formElementSection", cascade = [CascadeType.ALL], orphanRemoval = true)
+    @OrderColumn(name = "form_element_order")
     var formElements: MutableList<FormElement> = mutableListOf(),
     @ManyToOne
     @JoinColumn(name = "application_form_id", nullable = false)