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/js-polyfills/package.json

@@ -0,0 +1,23 @@
+{
+  "name": "@react-native/js-polyfills",
+  "version": "0.74.81",
+  "description": "Polyfills for React Native.",
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/facebook/react-native.git",
+    "directory": "packages/polyfills"
+  },
+  "homepage": "https://github.com/facebook/react-native/tree/HEAD/packages/polyfills#readme",
+  "keywords": [
+    "polyfill",
+    "polyfills",
+    "js",
+    "js-polyfills",
+    "react-native"
+  ],
+  "bugs": "https://github.com/facebook/react-native/issues",
+  "engines": {
+    "node": ">=18"
+  }
+}