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/cxxreact/CxxNativeModule.h

@@ -0,0 +1,68 @@
+/*
+ * 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.
+ */
+
+#pragma once
+
+#include <cxxreact/CxxModule.h>
+#include <cxxreact/NativeModule.h>
+
+#ifndef RN_EXPORT
+#define RN_EXPORT __attribute__((visibility("default")))
+#endif
+
+namespace facebook::react {
+
+class Instance;
+class MessageQueueThread;
+
+typedef void (*WarnOnUsageLogger)(std::string message);
+
+std::function<void(folly::dynamic)> makeCallback(
+    std::weak_ptr<Instance> instance,
+    const folly::dynamic& callbackId);
+
+class RN_EXPORT CxxNativeModule : public NativeModule {
+ public:
+  CxxNativeModule(
+      std::weak_ptr<Instance> instance,
+      std::string name,
+      xplat::module::CxxModule::Provider provider,
+      std::shared_ptr<MessageQueueThread> messageQueueThread)
+      : instance_(instance),
+        name_(std::move(name)),
+        provider_(provider),
+        messageQueueThread_(messageQueueThread) {}
+
+  std::string getName() override;
+  std::string getSyncMethodName(unsigned int methodId) override;
+  std::vector<MethodDescriptor> getMethods() override;
+  folly::dynamic getConstants() override;
+  void invoke(unsigned int reactMethodId, folly::dynamic&& params, int callId)
+      override;
+  MethodCallResult callSerializableNativeHook(
+      unsigned int hookId,
+      folly::dynamic&& args) override;
+
+  static void setShouldWarnOnUse(bool value);
+
+ private:
+  void lazyInit();
+
+  std::weak_ptr<Instance> instance_;
+  std::string name_;
+  xplat::module::CxxModule::Provider provider_;
+  std::shared_ptr<MessageQueueThread> messageQueueThread_;
+  std::unique_ptr<xplat::module::CxxModule> module_;
+  std::vector<xplat::module::CxxModule::Method> methods_;
+  void emitWarnIfWarnOnUsage(
+      const std::string& method_name,
+      const std::string& module_name);
+
+  static bool shouldWarnOnUse_;
+};
+
+} // namespace facebook::react