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/scripts/cocoapods/jsengine.rb

@@ -0,0 +1,33 @@
+# 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.
+
+require_relative './utils.rb'
+
+# It sets up the JavaScriptCore and JSI pods.
+#
+# @parameter react_native_path: relative path to react-native
+# @parameter fabric_enabled: whether Fabirc is enabled
+def setup_jsc!(react_native_path: "../node_modules/react-native", fabric_enabled: false)
+    pod 'React-jsi', :path => "#{react_native_path}/ReactCommon/jsi"
+    pod 'React-jsc', :path => "#{react_native_path}/ReactCommon/jsc"
+    if fabric_enabled
+        pod 'React-jsc/Fabric', :path => "#{react_native_path}/ReactCommon/jsc"
+    end
+end
+
+# It sets up the Hermes and JSI pods.
+#
+# @parameter react_native_path: relative path to react-native
+# @parameter fabric_enabled: whether Fabirc is enabled
+def setup_hermes!(react_native_path: "../node_modules/react-native")
+    react_native_dir = Pod::Config.instance.installation_root.join(react_native_path)
+    pod 'React-jsi', :path => "#{react_native_path}/ReactCommon/jsi"
+    # This `:tag => hermestag` below is only to tell CocoaPods to update hermes-engine when React Native version changes.
+    # We have custom logic to compute the source for hermes-engine. See sdks/hermes-engine/*
+    hermestag_file = File.join(react_native_dir, "sdks", ".hermesversion")
+    hermestag = File.exist?(hermestag_file) ? File.read(hermestag_file).strip : ''
+    pod 'hermes-engine', :podspec => "#{react_native_path}/sdks/hermes-engine/hermes-engine.podspec", :tag => hermestag
+    pod 'React-hermes', :path => "#{react_native_path}/ReactCommon/hermes"
+end