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/v3/views/auth/signup/components/Signup/Form.vue

@@ -99,8 +99,14 @@ export default {
       }
       return '';
     },
+    allowedLoginMethods() {
+      return window.chatwootConfig.allowedLoginMethods || ['email'];
+    },
     showGoogleOAuth() {
-      return Boolean(window.chatwootConfig.googleOAuthClientId);
+      return (
+        this.allowedLoginMethods.includes('google_oauth') &&
+        Boolean(window.chatwootConfig.googleOAuthClientId)
+      );
     },
     isFormValid() {
       return !this.v$.$invalid && this.hasAValidCaptcha;
@@ -296,7 +302,7 @@ export default {
     </form>
     <div class="flex flex-col">
       <SimpleDivider
-        v-if="showGoogleOAuth || showSamlLogin"
+        v-if="showGoogleOAuth"
         :label="$t('COMMON.OR')"
         bg="bg-n-background"
         class="uppercase"

app/javascript/v3/views/login/Index.vue

@@ -2,7 +2,6 @@
 // utils and composables
 import { login } from '../../api/auth';
 import { mapGetters } from 'vuex';
-import { parseBoolean } from '@chatwoot/utils';
 import { useAlert } from 'dashboard/composables';
 import { required, email } from '@vuelidate/validators';
 import { useVuelidate } from '@vuelidate/core';
@@ -85,14 +84,20 @@ export default {
   },
   computed: {
     ...mapGetters({ globalConfig: 'globalConfig/get' }),
+    allowedLoginMethods() {
+      return window.chatwootConfig.allowedLoginMethods || ['email'];
+    },
     showGoogleOAuth() {
-      return Boolean(window.chatwootConfig.googleOAuthClientId);
+      return (
+        this.allowedLoginMethods.includes('google_oauth') &&
+        Boolean(window.chatwootConfig.googleOAuthClientId)
+      );
     },
     showSignupLink() {
-      return parseBoolean(window.chatwootConfig.signupEnabled);
+      return window.chatwootConfig.signupEnabled === 'true';
     },
     showSamlLogin() {
-      return this.globalConfig.isEnterprise;
+      return this.allowedLoginMethods.includes('saml');
     },
   },
   created() {