feat: Control the allowed login methods via Super Admin (#12892)

- Control the allowed authentication methods for a chatwoot installation
via super admin configs. [SAML, Google Auth etc]
------
[Codex
Task](https://chatgpt.com/codex/tasks/task_e_6917d503b6e48326a261672c1de91462)

---------

Co-authored-by: Pranav <pranav@chatwoot.com>
Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>

app/javascript/dashboard/i18n/locale/en/settings.json

@@ -411,6 +411,7 @@
     "TITLE": "Security",
     "DESCRIPTION": "Manage your account security settings.",
     "LINK_TEXT": "Learn more about SAML SSO",
+    "SAML_DISABLED_MESSAGE": "SAML SSO is currently disabled. Please contact your administrator to enable this feature.",
     "SAML": {
       "TITLE": "SAML SSO",
       "NOTE": "Configure SAML single sign-on for your account. Users will authenticate through your identity provider instead of using email/password.",

app/javascript/dashboard/routes/dashboard/settings/security/Index.vue

@@ -10,13 +10,23 @@ import { INSTALLATION_TYPES } from 'dashboard/constants/installationTypes';
 import { FEATURE_FLAGS } from 'dashboard/featureFlags';
 const { shouldShow, shouldShowPaywall } = usePolicy();
 
-const shouldShowSaml = computed(() =>
-  shouldShow(
+const allowedLoginMethods = computed(
+  () => window.chatwootConfig.allowedLoginMethods || ['email']
+);
+
+const isSamlSsoEnabled = computed(() =>
+  allowedLoginMethods.value.includes('saml')
+);
+
+const shouldShowSaml = computed(() => {
+  const hasPermission = shouldShow(
     FEATURE_FLAGS.SAML,
     ['administrator'],
     [INSTALLATION_TYPES.CLOUD, INSTALLATION_TYPES.ENTERPRISE]
-  )
-);
+  );
+  return hasPermission && isSamlSsoEnabled.value;
+});
+
 const showPaywall = computed(() => shouldShowPaywall('saml'));
 </script>
 
@@ -36,6 +46,9 @@ const showPaywall = computed(() => shouldShowPaywall('saml'));
     <template #body>
       <SamlPaywall v-if="showPaywall" />
       <SamlSettings v-else-if="shouldShowSaml" />
+      <div v-else class="mt-6 text-sm text-slate-600">
+        {{ $t('SECURITY_SETTINGS.SAML_DISABLED_MESSAGE') }}
+      </div>
     </template>
   </SettingsLayout>
 </template>