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/@react-native-community/cli-debugger-ui/build/ui/index.css

@@ -0,0 +1,66 @@
+html,
+body {
+  font-family: Helvetica, Verdana, sans-serif;
+  font-size: large;
+  font-weight: 200;
+  height: 100%;
+  margin: 0;
+  padding: 0;
+}
+.shortcut {
+  border-radius: 4px;
+  color: #eee;
+  background-color: #333;
+  font-family: 'Monaco', monospace;
+  font-size: medium;
+  letter-spacing: 3px;
+  padding: 4px;
+}
+.content {
+  padding: 10px;
+}
+.reload-btn {
+  padding: 5px 10px;
+}
+body.dark {
+  background-color: #242424;
+  color: #afafaf;
+}
+.dark .shortcut {
+  color: #c1c1c1;
+}
+.dark a {
+  color: #3b99fc;
+}
+input[type='checkbox'] {
+  vertical-align: middle;
+}
+
+.warning {
+  box-sizing: border-box;
+  max-width: 800px;
+  padding: 16px;
+  margin-bottom: 1em;
+  border-left: 5px solid rgb(230, 167, 0);
+  border-radius: 6px;
+  background-color: rgb(255, 248, 230);
+  box-shadow: rgba(0, 0, 0, 0.1) 0px 1px 2px 0px;
+  color: rgb(77, 56, 0);
+  font-size: 16px;
+  font-weight: 500;
+  line-height: 1.6;
+}
+
+.warning p {
+  margin-top: 0;
+}
+
+.warning p:last-child {
+  margin: 0;
+}
+
+.dark .warning {
+  background: rgb(77, 56, 0);
+  border-left-color: rgb(230, 167, 0);
+  color: rgb(255, 248, 230);
+}