feat(smart-app): complete all remaining components, screens, hooks, services, stores, i18n
- i18n/index.ts: i18next setup with FR/EN/ES/DE translations
- constants.ts: app config, sensor types, alert severity, storage keys, refresh intervals
- store/index.ts: barrel export for all stores
- iotStore.ts: full IoT store (6 sensors, 3 zones, 2 alerts) with actions
- notificationStore.ts: notification store (5 mock notifications) with actions
- uiStore.ts: theme/language store + translation maps for 4 languages
- useSensors.ts: sensor filtering by type/zone, alert sensors selector
- useAlerts.ts: active alerts, critical alerts, acknowledge
- useNotifications.ts: notification CRUD operations
- useLocation.ts: GPS location with expo-location, default Fort-de-France
- SensorCard.tsx: full sensor card with status dot, compact mode
- StatsCard.tsx: stats card with icon, value, trend
- AlertCard.tsx: alert card with severity bar, acknowledge button
- ZoneCard.tsx: zone card with color bar, sensor/alert counts
- LineChart.tsx: bar-based line chart with Y-axis labels
- BarChart.tsx: bar chart with value labels
- GaugeChart.tsx: semi-circular gauge with color thresholds
- MapView.tsx: map placeholder with overlay markers
- MarkerPopup.tsx: popup with title, value, status, detail button
- DashboardScreen.tsx: analytics dashboard with gauges + charts
- SensorDetailScreen.tsx: sensor detail with gauge + history chart
- NotificationPrefsScreen.tsx: notification preference toggles (4)
- LayerDetailScreen.tsx: layer detail placeholder
- iot.service.ts: CRUD operations for sensors, zones, alerts
- gis.service.ts: geocoding, POI search, routing
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