Add super-admin Administration section and restructure global vs company settings

- Add Administration sidebar section (super-admin only) with Companies, Users, and Global Settings pages
- Add super-admin middleware, controllers, and API routes under /api/v1/super-admin/
- Allow super-admins to manage all companies and users across tenants
- Add user impersonation with short-lived tokens, audit logging, and UI banner
- Move system-level settings (Mail, PDF, Backup, Update, File Disk) from per-company to Administration > Global Settings
- Convert save_pdf_to_disk from CompanySetting to global Setting
- Add per-company mail configuration overrides (optional, falls back to global)
- Add CompanyMailConfigService to apply company mail config before sending emails

resources/scripts/admin/components/dropdowns/AdminCompanyIndexDropdown.vue

@@ -0,0 +1,34 @@
+<template>
+  <BaseDropdown>
+    <template #activator>
+      <BaseIcon name="EllipsisHorizontalIcon" class="h-5 text-gray-500" />
+    </template>
+
+    <router-link :to="`/admin/administration/companies/${row.id}/edit`">
+      <BaseDropdownItem>
+        <BaseIcon
+          name="PencilIcon"
+          class="w-5 h-5 mr-3 text-gray-400 group-hover:text-gray-500"
+        />
+        {{ $t('general.edit') }}
+      </BaseDropdownItem>
+    </router-link>
+  </BaseDropdown>
+</template>
+
+<script setup>
+defineProps({
+  row: {
+    type: Object,
+    default: null,
+  },
+  table: {
+    type: Object,
+    default: null,
+  },
+  loadData: {
+    type: Function,
+    default: null,
+  },
+})
+</script>