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/scripts/xcode/ccache-clang++.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
+# Get the absolute path of this script
+SCRIPT_DIR="$(dirname "$(readlink -f "$0")")"
+
+REACT_NATIVE_CCACHE_CONFIGPATH=$SCRIPT_DIR/ccache.conf
+# Provide our config file if none is already provided
+export CCACHE_CONFIGPATH="${CCACHE_CONFIGPATH:-$REACT_NATIVE_CCACHE_CONFIGPATH}"
+
+exec ccache clang++ "$@"

smart-app-city/frontend/node_modules/react-native/scripts/xcode/ccache-clang.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
+# Get the absolute path of this script
+SCRIPT_DIR="$(dirname "$(readlink -f "$0")")"
+
+REACT_NATIVE_CCACHE_CONFIGPATH=$SCRIPT_DIR/ccache.conf
+# Provide our config file if none is already provided
+export CCACHE_CONFIGPATH="${CCACHE_CONFIGPATH:-$REACT_NATIVE_CCACHE_CONFIGPATH}"
+
+exec ccache clang "$@"

smart-app-city/frontend/node_modules/react-native/scripts/xcode/ccache.conf

@@ -0,0 +1,11 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
+# See https://ccache.dev/manual/4.3.html#_configuration_options for details and available options
+
+sloppiness = clang_index_store,file_stat_matches,include_file_ctime,include_file_mtime,ivfsoverlay,pch_defines,modules,system_headers,time_macros
+file_clone = true
+depend_mode = true
+inode_cache = true

smart-app-city/frontend/node_modules/react-native/scripts/xcode/with-environment.sh

@@ -0,0 +1,47 @@
+#!/bin/bash
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
+# This script is used to source in Xcode the environment settings required to run properly.
+# The script first sources the base `.xcode.env` file.
+# Then it sources the `.xcode.env.local` file if present, to override some local config
+# Finally, it will execute the command passed i input if any.
+#
+# USAGE:
+# ./with-environment.sh command
+
+# Start with a default
+NODE_BINARY=$(command -v node || echo "")
+export NODE_BINARY
+
+# Override the default with the global environment
+ENV_PATH="$PODS_ROOT/../.xcode.env"
+if [ -f "$ENV_PATH" ]; then
+    source "$ENV_PATH"
+fi
+
+# Override the global with the local environment
+LOCAL_ENV_PATH="${ENV_PATH}.local"
+if [ -f "$LOCAL_ENV_PATH" ]; then
+    source "$LOCAL_ENV_PATH"
+fi
+
+# Check whether NODE_BINARY has been properly set, otherwise help the users with a meaningful error.
+if [ -n "$NODE_BINARY" ]; then
+    echo "Node found at: ${NODE_BINARY}"
+else
+    echo '[Warning] You need to configure your node path in the `".xcode.env" file` environment. ' \
+       'You can set it up quickly by running: ' \
+       '`echo export NODE_BINARY=$(command -v node) > .xcode.env` ' \
+       'in the ios folder. This is needed by React Native to work correctly. ' \
+       'We fallback to the DEPRECATED behavior of finding `node`. This will be REMOVED in a future version. ' \
+       'You can read more about this here: https://reactnative.dev/docs/environment-setup#optional-configuring-your-environment' >&2
+    source "${REACT_NATIVE_PATH}/scripts/find-node-for-xcode.sh"
+fi
+
+# Execute argument, if present
+if [ -n "$1" ]; then
+  $1
+fi