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/plugin/buddhistEra/index.d.ts

@@ -0,0 +1,4 @@
+import { PluginFunc } from 'dayjs/esm'
+
+declare const plugin: PluginFunc
+export = plugin

smart-app-city/frontend/node_modules/dayjs/esm/plugin/buddhistEra/index.js

@@ -0,0 +1,21 @@
+import { FORMAT_DEFAULT } from '../../constant';
+export default (function (o, c) {
+  // locale needed later
+  var proto = c.prototype;
+  var oldFormat = proto.format; // extend en locale here
+
+  proto.format = function (formatStr) {
+    var _this = this;
+
+    var yearBias = 543;
+    var str = formatStr || FORMAT_DEFAULT;
+    var result = str.replace(/(\[[^\]]+])|BBBB|BB/g, function (match, a) {
+      var _this$$utils;
+
+      var year = String(_this.$y + yearBias);
+      var args = match === 'BB' ? [year.slice(-2), 2] : [year, 4];
+      return a || (_this$$utils = _this.$utils()).s.apply(_this$$utils, args.concat(['0']));
+    });
+    return oldFormat.bind(this)(result);
+  };
+});