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/yaml/dist/util.d.ts

@@ -0,0 +1,16 @@
+export { createNode } from './doc/createNode';
+export type { CreateNodeContext } from './doc/createNode';
+export { debug, warn } from './log';
+export type { LogLevelId } from './log';
+export { createPair } from './nodes/Pair';
+export { toJS } from './nodes/toJS';
+export type { ToJSContext } from './nodes/toJS';
+export { findPair } from './nodes/YAMLMap';
+export { map as mapTag } from './schema/common/map';
+export { seq as seqTag } from './schema/common/seq';
+export { string as stringTag } from './schema/common/string';
+export { foldFlowLines } from './stringify/foldFlowLines';
+export type { FoldOptions } from './stringify/foldFlowLines';
+export type { StringifyContext } from './stringify/stringify';
+export { stringifyNumber } from './stringify/stringifyNumber';
+export { stringifyString } from './stringify/stringifyString';