fix : use MalioButton/MalioButtonIcon everywhere, fix env count and fixture URLs

- Replace all native HTML buttons with MalioButton and MalioButtonIcon components
- Add app:read group on environments relation to fix 0 count in list
- Fix fixture URLs (http for apps, https for gitea)
- Maintenance icons: alert-outline (activate) / shield-check-outline (deactivate)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/pages/applications/index.vue

@@ -53,12 +53,12 @@ onMounted(loadApplications)
     <div class="px-4 py-8 sm:px-8 lg:px-16">
         <div class="flex items-center justify-between pb-6">
             <h1 class="text-2xl font-bold text-primary-500 sm:text-4xl">{{ t('applications.title') }}</h1>
-            <button
-                class="rounded-lg bg-primary-500 px-4 py-2 text-sm font-semibold text-white hover:bg-secondary-500"
+            <MalioButton
+                :label="t('applications.addButton')"
+                icon-name="mdi:plus"
+                icon-position="left"
                 @click="openCreateModal"
-            >
-                + {{ t('applications.addButton') }}
-            </button>
+            />
         </div>
 
         <!-- Loading -->