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/browserslist/README.md

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+# Browserslist
+
+<img width="120" height="120" alt="Browserslist logo by Anton Popov"
+     src="https://browsersl.ist/logo.svg" align="right">
+
+The config to share target browsers and Node.js versions between different
+front-end tools. It is used in:
+
+- [Autoprefixer]
+- [Babel]
+- [postcss-preset-env]
+- [eslint-plugin-compat]
+- [stylelint-no-unsupported-browser-features]
+- [postcss-normalize]
+- [obsolete-webpack-plugin]
+
+All tools will find target browsers automatically,
+when you add the following to `package.json`:
+
+```json
+  "browserslist": [
+    "defaults and fully supports es6-module",
+    "maintained node versions"
+  ]
+```
+
+Or in `.browserslistrc` config:
+
+```yaml
+# Browsers that we support
+
+defaults and fully supports es6-module
+maintained node versions
+```
+
+Developers set their version lists using queries like `last 2 versions`
+to be free from updating versions manually.
+Browserslist will use [`caniuse-lite`] with [Can I Use] data for this queries.
+
+You can check how config works at our playground: [`browsersl.ist`](https://browsersl.ist/)
+
+<a href="https://browsersl.ist/">
+  <img src="/img/screenshot.webp" alt="browsersl.ist website">
+</a>
+
+<br>
+<br>
+<div align="center">
+  <a href="https://evilmartians.com/?utm_source=browserslist"><img src="https://evilmartians.com/badges/sponsored-by-evil-martians.svg" alt="Sponsored by Evil Martians" width="236" height="54"></a>  <a href="https://cube.dev/?ref=eco-browserslist-github"><img src="https://user-images.githubusercontent.com/986756/154330861-d79ab8ec-aacb-4af8-9e17-1b28f1eccb01.svg" alt="Supported by Cube" width="227" height="46"></a>
+</div>
+
+[stylelint-no-unsupported-browser-features]: https://github.com/ismay/stylelint-no-unsupported-browser-features
+[obsolete-webpack-plugin]: https://github.com/ElemeFE/obsolete-webpack-plugin
+[eslint-plugin-compat]: https://github.com/amilajack/eslint-plugin-compat
+[postcss-preset-env]: https://github.com/csstools/postcss-plugins/tree/main/plugin-packs/postcss-preset-env
+[postcss-normalize]: https://github.com/csstools/postcss-normalize
+[`browsersl.ist`]: https://browsersl.ist/
+[`caniuse-lite`]: https://github.com/ben-eb/caniuse-lite
+[Autoprefixer]: https://github.com/postcss/autoprefixer
+[Can I Use]: https://caniuse.com/
+[Babel]: https://github.com/babel/babel/tree/master/packages/babel-preset-env
+
+## Docs
+Read full docs **[here](https://github.com/browserslist/browserslist#readme)**.