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/debugger-frontend/README.md

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+# @react-native/debugger-frontend
+
+![npm package](https://img.shields.io/npm/v/@react-native/debugger-frontend?color=brightgreen&label=npm%20package)
+
+Debugger frontend for React Native based on Chrome DevTools.
+
+This package is internal to React Native and is intended to be used via [`@react-native/dev-middleware`](https://www.npmjs.com/package/@react-native/dev-middleware).
+
+## Usage
+
+The package exports the absolute path to the directory containing the frontend assets.
+
+```js
+const frontendPath = require('@react-native/debugger-frontend');
+
+// Pass frontendPath to a static server, etc
+```
+
+## Contributing
+
+### Source repo
+
+Source code for this package lives in the [facebookexperimental/rn-chrome-devtools-frontend](https://github.com/facebookexperimental/rn-chrome-devtools-frontend) repo. See below for how we build and check in changes.
+
+### Updating the frontend assets
+
+The compiled assets for the debugger frontend are periodically checked into this package under the `dist/` folder. To update these, run `node scripts/debugger-frontend/sync-and-build` from the root of your `react-native` checkout.
+
+```sh
+# For main
+node scripts/debugger-frontend/sync-and-build --branch main
+
+# For stable branches (e.g. '0.73-stable')
+node scripts/debugger-frontend/sync-and-build --branch 0.73-stable
+```
+
+By default, this will clone and build from [facebookexperimental/rn-chrome-devtools-frontend](https://github.com/facebookexperimental/rn-chrome-devtools-frontend).