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/react-native/ReactCommon/react/config/ReactNativeConfig.cpp

@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#include "ReactNativeConfig.h"
+
+namespace facebook::react {
+
+bool EmptyReactNativeConfig::getBool(const std::string& param) const {
+  if (param == "react_fabric:enabled_layout_animations_ios") {
+    return true;
+  }
+  if (param == "react_fabric:enabled_automatic_interop_android") {
+    return true;
+  }
+  return false;
+}
+
+std::string EmptyReactNativeConfig::getString(const std::string& param) const {
+  return "";
+}
+
+int64_t EmptyReactNativeConfig::getInt64(const std::string& param) const {
+  return 0;
+}
+
+double EmptyReactNativeConfig::getDouble(const std::string& param) const {
+  return 0.0;
+}
+
+} // namespace facebook::react