feat(users) : ajout prénom et nom sur l'utilisateur

Deux colonnes nullable firstName/lastName sur User (groupes me:read,
user:list, user:write), éditables dans le drawer utilisateur (admin).
L'affichage reste basé sur le username pour l'instant. Migration +
valeurs de démo dans les fixtures.

frontend/components/user/UserDrawer.vue

@@ -11,6 +11,16 @@
                 :error="touched.username && !form.username.trim() ? 'Le nom est requis' : ''"
                 @blur="touched.username = true"
             />
+            <MalioInputText
+                v-model="form.firstName"
+                label="Prénom"
+                input-class="w-full"
+            />
+            <MalioInputText
+                v-model="form.lastName"
+                label="Nom"
+                input-class="w-full"
+            />
             <MalioInputPassword
                 v-model="form.password"
                 label="Mot de passe"
@@ -84,6 +94,8 @@ const isSubmitting = ref(false)
 
 const form = reactive({
     username: '',
+    firstName: '',
+    lastName: '',
     password: '',
     roles: [] as string[],
     isEmployee: false,
@@ -98,11 +110,15 @@ watch(() => props.modelValue, (open) => {
     if (open) {
         if (props.item) {
             form.username = props.item.username ?? ''
+            form.firstName = props.item.firstName ?? ''
+            form.lastName = props.item.lastName ?? ''
             form.password = ''
             form.roles = [...props.item.roles]
             form.isEmployee = props.item.isEmployee ?? false
         } else {
             form.username = ''
+            form.firstName = ''
+            form.lastName = ''
             form.password = ''
             form.roles = ['ROLE_USER']
             form.isEmployee = false
@@ -124,6 +140,8 @@ async function handleSubmit() {
     try {
         const payload: UserWrite = {
             username: form.username.trim(),
+            firstName: form.firstName.trim() || null,
+            lastName: form.lastName.trim() || null,
             roles: form.roles,
             isEmployee: form.isEmployee,
         }