feat: add category duplication functionality

as-talange-web/src/main/resources/templates/parametrage/categories_form.html

@@ -22,6 +22,10 @@
                 <form th:action="@{/categories}" th:object="${categorie}" method="post" class="space-y-6">
                     <input type="hidden" th:field="*{id}" />
 
+                    <div th:if="${errorMessage}" class="bg-red-50 border-l-4 border-red-500 p-4 mb-6">
+                        <p class="text-sm text-red-700" th:text="${errorMessage}"></p>
+                    </div>
+
                     <div class="grid grid-cols-2 gap-4">
                         <div>
                             <label class="block text-sm font-medium text-gray-700 mb-1">Nom (ex: U15)</label>

as-talange-web/src/main/resources/templates/parametrage/categories_list.html

@@ -56,6 +56,9 @@
                             <td class="py-4 px-6 text-right font-medium text-purple-600" th:text="${cat.tarifExterieur != null ? cat.tarifExterieur + ' €' : '-'}">130.00 €</td>
                             <td class="py-4 px-6 text-right flex justify-end space-x-3 items-center">
                                 <a th:href="@{/categories/{id}/edit(id=${cat.id})}" class="text-indigo-600 hover:text-indigo-900 font-medium bg-indigo-50 px-3 py-1 rounded-lg">Modifier</a>
+                                <form th:action="@{/categories/{id}/duplicate(id=${cat.id})}" method="post">
+                                    <button type="submit" class="text-green-600 hover:text-green-800 font-medium bg-green-50 px-3 py-1 rounded-lg">Dupliquer</button>
+                                </form>
                                 <form th:action="@{/categories/{id}/delete(id=${cat.id})}" method="post" onsubmit="return confirm('Supprimer cette catégorie ?');">
                                     <button type="submit" class="text-red-600 hover:text-red-800 font-medium">Supprimer</button>
                                 </form>