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/inputAmount.vue

@@ -36,6 +36,23 @@
       />
     </div>
 
+    <div class="rounded-lg border p-4">
+      <h2 class="mb-4 text-xl font-bold">Readonly (readonly vide)</h2>
+      <MalioInputAmount
+        label="Montant (readonly vide)"
+        :readonly="true"
+      />
+    </div>
+
+    <div class="rounded-lg border p-4">
+      <h2 class="mb-4 text-xl font-bold">Readonly (readonly rempli)</h2>
+      <MalioInputAmount
+        v-model="readonlyFilledAmount"
+        label="Montant (readonly rempli)"
+        :readonly="true"
+      />
+    </div>
+
     <div class="rounded-lg border p-4">
       <h2 class="mb-4 text-xl font-bold">Erreur et succès</h2>
       <div class="mt-4">
@@ -57,4 +74,7 @@
 </template>
 
 <script setup lang="ts">
+import { ref } from 'vue'
+
+const readonlyFilledAmount = ref('1250.00')
 </script>