fix and update

apps/frontend/public/sso-widget.js

@@ -71,30 +71,66 @@
       return Promise.resolve(null);
     }
 
-    return global.navigator.credentials
-      .get({
-        identity: {
-          providers: [
-            {
-              configURL: idpApiBase + '/fedcm/config.json',
-              clientId: clientId
-            }
-          ]
-        },
-        mediation: 'optional'
+    function requestFedCM(configBase) {
+      return global.navigator.credentials
+        .get({
+          identity: {
+            providers: [
+              {
+                configURL: configBase + '/fedcm/config.json',
+                configUrl: configBase + '/fedcm/config.json',
+                clientId: clientId
+              }
+            ]
+          },
+          mediation: 'optional'
+        })
+        .then(function (credential) {
+          if (!credential || typeof credential !== 'object') return null;
+          var token = credential.token;
+          if (!token) return null;
+          return {
+            token: token,
+            method: 'fedcm'
+          };
+        });
+    }
+
+    return global.fetch(idpApiBase + '/fedcm/discover.json', { credentials: 'omit' })
+      .then(function (response) {
+        if (!response.ok) {
+          return idpApiBase;
+        }
+        return response.json().then(function (payload) {
+          if (payload && payload.enabled === false) {
+            return null;
+          }
+          if (payload && payload.apiBase) {
+            return trimSlash(payload.apiBase);
+          }
+          return idpApiBase;
+        });
       })
-      .then(function (credential) {
-        if (!credential || typeof credential !== 'object') return null;
-        var token = credential.token;
-        if (!token) return null;
-        return {
-          token: token,
-          method: 'fedcm'
-        };
+      .catch(function () {
+        return idpApiBase;
+      })
+      .then(function (resolvedBase) {
+        if (!resolvedBase) {
+          return null;
+        }
+        return requestFedCM(resolvedBase);
       })
       .catch(function (error) {
         if (global.console && typeof global.console.warn === 'function') {
-          global.console.warn('[MVK ID] FedCM недоступен:', error);
+          global.console.warn(
+            '[MVK ID] FedCM недоступен:',
+            error,
+            'Проверьте доступность',
+            idpApiBase + '/fedcm/config.json',
+            'и',
+            idpApiBase.replace(/\/idp-api$/, '') + '/.well-known/web-identity',
+            '(PUBLIC_API_URL должен совпадать с data-idp-url виджета)'
+          );
         }
         return null;
       });
@@ -232,10 +268,6 @@
         return;
       }
 
-      if (supportsFedCM()) {
-        return;
-      }
-
       createWidget(providerName, function () {
         var popupUrl = buildPopupUrl(frontendBase, clientId, global.location.origin, redirectUri, scope);
         openPopup(popupUrl, frontendBase, function (payload) {