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/bg.js

@@ -0,0 +1,55 @@
+// Bulgarian [bg]
+import dayjs from '../index';
+var locale = {
+  name: 'bg',
+  weekdays: 'неделя_понеделник_вторник_сряда_четвъртък_петък_събота'.split('_'),
+  weekdaysShort: 'нед_пон_вто_сря_чет_пет_съб'.split('_'),
+  weekdaysMin: 'нд_пн_вт_ср_чт_пт_сб'.split('_'),
+  months: 'януари_февруари_март_април_май_юни_юли_август_септември_октомври_ноември_декември'.split('_'),
+  monthsShort: 'яну_фев_мар_апр_май_юни_юли_авг_сеп_окт_ное_дек'.split('_'),
+  weekStart: 1,
+  ordinal: function ordinal(n) {
+    var last2Digits = n % 100;
+
+    if (last2Digits > 10 && last2Digits < 20) {
+      return n + "-\u0442\u0438";
+    }
+
+    var lastDigit = n % 10;
+
+    if (lastDigit === 1) {
+      return n + "-\u0432\u0438";
+    } else if (lastDigit === 2) {
+      return n + "-\u0440\u0438";
+    } else if (lastDigit === 7 || lastDigit === 8) {
+      return n + "-\u043C\u0438";
+    }
+
+    return n + "-\u0442\u0438";
+  },
+  formats: {
+    LT: 'H:mm',
+    LTS: 'H:mm:ss',
+    L: 'D.MM.YYYY',
+    LL: 'D MMMM YYYY',
+    LLL: 'D MMMM YYYY H:mm',
+    LLLL: 'dddd, D MMMM YYYY H:mm'
+  },
+  relativeTime: {
+    future: 'след %s',
+    past: 'преди %s',
+    s: 'няколко секунди',
+    m: 'минута',
+    mm: '%d минути',
+    h: 'час',
+    hh: '%d часа',
+    d: 'ден',
+    dd: '%d дена',
+    M: 'месец',
+    MM: '%d месеца',
+    y: 'година',
+    yy: '%d години'
+  }
+};
+dayjs.locale(locale, null, true);
+export default locale;