docs(playground) : exemples readonly

Ajout de deux blocs readonly (vide + rempli) sur chaque page playground
concernée : InputText, InputEmail, InputAmount, InputAutocomplete,
InputPassword, InputTextArea, InputPhone, InputUpload, Date, TimePicker.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.playground/pages/composant/input/inputText.vue

@@ -108,6 +108,25 @@
         icon-size="20"
       />
     </div>
+    <div class="rounded-lg border p-4">
+      <h2 class="mb-4 text-xl font-bold">Readonly (readonly vide)</h2>
+      <MalioInputText
+        label="Référence (readonly vide)"
+        :readonly="true"
+      />
+    </div>
+
+    <div class="rounded-lg border p-4">
+      <h2 class="mb-4 text-xl font-bold">Readonly (readonly rempli)</h2>
+      <MalioInputText
+        v-model="readonlyFilledValue"
+        label="Référence (readonly rempli)"
+        icon-name="mdi:lock-outline"
+        icon-size="20"
+        :readonly="true"
+      />
+    </div>
+
     <div class="rounded-lg border p-4">
       <h2 class="mb-4 text-xl font-bold">Champ obligatoire</h2>
       <MalioInputText
@@ -162,6 +181,7 @@
 
 <script setup lang="ts">
 import { computed, ref } from 'vue'
+const readonlyFilledValue = ref('Commande #A-2048')
 const nameValue = ref('')
 const searchValue = ref('')
 const codeValue = ref('')