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/wonka/src/dune/.merlin

@@ -0,0 +1,10 @@
+EXCLUDE_QUERY_DIR
+B /Users/phil/.esy/3____________________________________________________________________/i/belt-d295eda5/lib/belt
+B /Users/phil/Development/wonka/_esy/default/store/b/wonka-3b561974/default/src/dune/.wonka.objs/byte
+S /Users/phil/.esy/3____________________________________________________________________/i/belt-d295eda5/lib/belt
+S ..
+S .
+S ../helpers
+S ../include/rebel_native
+FLG -ppx '/Users/phil/Development/wonka/_esy/default/store/b/wonka-3b561974/default/.ppx/1532bed008d8875f00cab31e45a595e2/ppx.exe --as-ppx --cookie '\''library-name="wonka"'\'''
+FLG -open Wonka__ -w -40

smart-app-city/frontend/node_modules/wonka/src/dune/Rebel.re

@@ -0,0 +1 @@
+include Rebel_native;

smart-app-city/frontend/node_modules/wonka/src/dune/Wonka.re

@@ -0,0 +1,4 @@
+module Types = Wonka_types;
+include Wonka_sources;
+include Wonka_operators;
+include Wonka_sinks;

smart-app-city/frontend/node_modules/wonka/src/dune/dune

@@ -0,0 +1,9 @@
+(library
+  (name wonka)
+  (public_name wonka)
+  (libraries belt)
+  (preprocess (pps belt.ppx)))
+
+(copy_files ../include/rebel_native/*.{re,rei})
+(copy_files ../Wonka_*.{re,rei})
+(copy_files ../helpers/Wonka_*.{re,rei})