feat(smart-app): implement complete mobile app MVP

- App.tsx: full navigation (Auth stack + Main tabs with 5 screens)
- Auth: LoginScreen, RegisterScreen, ForgotPasswordScreen
- HomeScreen: dashboard with IoT metrics, weather widget, alerts, quick actions, sensors
- MapScreen: interactive map with layer toggles (6 layers)
- MarketplaceScreen: categories (6), products (5), search
- ChatScreen: AI chat with quick prompts (4), bot responses
- ProfileScreen: user info, stats, menu (9 items), logout
- AlertsScreen: alert list with severity, acknowledge
- SensorsScreen: sensor list with type filters (6 types), search
- ZonesScreen: zone cards with stats
- SettingsScreen: language picker (FR/EN/ES/DE), privacy, about
- Stores: iotStore (sensors, zones, alerts), notificationStore, uiStore + i18n
- Hooks: useSensors, useAlerts, useNotifications, useLocation
- Components: Card, Button, LoadingSpinner, ErrorBoundary, Header
- Services: iotService, notificationService (with axios API client)
- Utils: formatters (temp, AQI, noise, dates), validators (email, password, IBAN)
- Theme: colors.ts with full design system (Blue Ocean palette)
- Ditto: fixed MongoDB connection, new JWT secrets, official gateway image

smart-app-city/frontend/node_modules/fbjs/lib/__mocks__/ErrorUtils.js

@@ -0,0 +1,16 @@
+/**
+ * Copyright (c) 2013-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+'use strict';
+
+var ErrorUtils = jest.genMockFromModule("../ErrorUtils");
+ErrorUtils.applyWithGuard.mockImplementation(function (callback, context, args) {
+  return callback.apply(context, args);
+});
+ErrorUtils.guard.mockImplementation(function (callback) {
+  return callback;
+});
+module.exports = ErrorUtils;

smart-app-city/frontend/node_modules/fbjs/lib/__mocks__/base62.js

@@ -0,0 +1,9 @@
+/**
+ * Copyright (c) 2013-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+'use strict';
+
+module.exports = require.requireActual("../base62");

smart-app-city/frontend/node_modules/fbjs/lib/__mocks__/crc32.js

@@ -0,0 +1,9 @@
+/**
+ * Copyright (c) 2013-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+'use strict';
+
+module.exports = require.requireActual("../crc32");

smart-app-city/frontend/node_modules/fbjs/lib/__mocks__/fetch.js

@@ -0,0 +1,19 @@
+/**
+ * Copyright (c) 2013-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @noflow
+ */
+'use strict';
+
+var Deferred = require.requireActual("../Deferred");
+
+var fetch = jest.fn(function (uri, options) {
+  var deferred = new Deferred();
+  fetch.mock.deferreds.push(deferred);
+  return deferred.getPromise();
+});
+fetch.mock.deferreds = [];
+module.exports = fetch;

smart-app-city/frontend/node_modules/fbjs/lib/__mocks__/fetchWithRetries.js

@@ -0,0 +1,29 @@
+/**
+ * Copyright (c) 2013-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @noflow
+ */
+'use strict';
+
+var Deferred = require.requireActual("../Deferred");
+
+function fetchWithRetries() {
+  var deferred = new Deferred();
+
+  for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {
+    args[_key] = arguments[_key];
+  }
+
+  fetchWithRetries.mock.calls.push(args);
+  fetchWithRetries.mock.deferreds.push(deferred);
+  return deferred.getPromise();
+}
+
+fetchWithRetries.mock = {
+  calls: [],
+  deferreds: []
+};
+module.exports = fetchWithRetries;

smart-app-city/frontend/node_modules/fbjs/lib/__mocks__/nullthrows.js

@@ -0,0 +1,10 @@
+/**
+ * Copyright (c) 2013-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+'use strict';
+
+jest.unmock("../nullthrows");
+module.exports = require("../nullthrows");