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/dayjs/esm/locale/mn.js

@@ -0,0 +1,38 @@
+// Mongolian [mn]
+import dayjs from '../index';
+var locale = {
+  name: 'mn',
+  weekdays: 'Ням_Даваа_Мягмар_Лхагва_Пүрэв_Баасан_Бямба'.split('_'),
+  months: 'Нэгдүгээр сар_Хоёрдугаар сар_Гуравдугаар сар_Дөрөвдүгээр сар_Тавдугаар сар_Зургадугаар сар_Долдугаар сар_Наймдугаар сар_Есдүгээр сар_Аравдугаар сар_Арван нэгдүгээр сар_Арван хоёрдугаар сар'.split('_'),
+  weekdaysShort: 'Ням_Дав_Мяг_Лха_Пүр_Баа_Бям'.split('_'),
+  monthsShort: '1 сар_2 сар_3 сар_4 сар_5 сар_6 сар_7 сар_8 сар_9 сар_10 сар_11 сар_12 сар'.split('_'),
+  weekdaysMin: 'Ня_Да_Мя_Лх_Пү_Ба_Бя'.split('_'),
+  ordinal: function ordinal(n) {
+    return n;
+  },
+  formats: {
+    LT: 'HH:mm',
+    LTS: 'HH:mm:ss',
+    L: 'YYYY-MM-DD',
+    LL: 'YYYY оны MMMMын D',
+    LLL: 'YYYY оны MMMMын D HH:mm',
+    LLLL: 'dddd, YYYY оны MMMMын D HH:mm'
+  },
+  relativeTime: {
+    future: '%s',
+    past: '%s',
+    s: 'саяхан',
+    m: 'м',
+    mm: '%dм',
+    h: '1ц',
+    hh: '%dц',
+    d: '1ө',
+    dd: '%dө',
+    M: '1с',
+    MM: '%dс',
+    y: '1ж',
+    yy: '%dж'
+  }
+};
+dayjs.locale(locale, null, true);
+export default locale;