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/ReactCommon/runtimeexecutor/.clang-tidy

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+---
+Checks: '>
+clang-diagnostic-*,
+'
+InheritParentConfig: true
+...

smart-app-city/frontend/node_modules/react-native/ReactCommon/runtimeexecutor/CMakeLists.txt

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+# 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.
+
+cmake_minimum_required(VERSION 3.13)
+set(CMAKE_VERBOSE_MAKEFILE on)
+
+add_compile_options(
+        -fexceptions
+        -frtti
+        -std=c++20
+        -Wall
+        -Wpedantic)
+
+file(GLOB_RECURSE runtimeexecutor_SRC CONFIGURE_DEPENDS *.cpp *.h)
+
+add_library(runtimeexecutor SHARED ${runtimeexecutor_SRC})
+
+target_include_directories(runtimeexecutor PUBLIC .)
+
+target_link_libraries(runtimeexecutor jsi)

smart-app-city/frontend/node_modules/react-native/ReactCommon/runtimeexecutor/React-runtimeexecutor.podspec

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+# 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.
+
+require "json"
+
+package = JSON.parse(File.read(File.join(__dir__, "..", "..", "package.json")))
+version = package['version']
+
+source = { :git => 'https://github.com/facebook/react-native.git' }
+if version == '1000.0.0'
+  # This is an unpublished version, use the latest commit hash of the react-native repo, which we’re presumably in.
+  source[:commit] = `git rev-parse HEAD`.strip if system("git rev-parse --git-dir > /dev/null 2>&1")
+else
+  source[:tag] = "v#{version}"
+end
+
+folly_config = get_folly_config()
+folly_compiler_flags = folly_config[:compiler_flags]
+folly_version = folly_config[:version]
+boost_compiler_flags = '-Wno-documentation'
+
+Pod::Spec.new do |s|
+  s.name                   = "React-runtimeexecutor"
+  s.version                = version
+  s.summary                = "-"  # TODO
+  s.homepage               = "https://reactnative.dev/"
+  s.license                = package["license"]
+  s.author                 = "Meta Platforms, Inc. and its affiliates"
+  s.platforms              = min_supported_versions
+  s.source                 = source
+  s.source_files           = "**/*.{cpp,h}"
+  s.header_dir             = "ReactCommon"
+
+  s.dependency "React-jsi", version
+end

smart-app-city/frontend/node_modules/react-native/ReactCommon/runtimeexecutor/ReactCommon/RuntimeExecutor.h

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+/*
+ * 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.
+ */
+
+#pragma once
+
+#include <mutex>
+#include <thread>
+
+#include <jsi/jsi.h>
+
+namespace facebook::react {
+
+/*
+ * Takes a function and calls it with a reference to a Runtime. The function
+ * will be called when it is safe to do so (i.e. it ensures non-concurrent
+ * access) and may be invoked asynchronously, depending on the implementation.
+ * If you need to access a Runtime, it's encouraged to use a RuntimeExecutor
+ * instead of storing a pointer to the Runtime itself, which makes it more
+ * difficult to ensure that the Runtime is being accessed safely.
+ */
+using RuntimeExecutor =
+    std::function<void(std::function<void(jsi::Runtime& runtime)>&& callback)>;
+
+/*
+ * The caller can expect that the callback will be executed sometime later on an
+ * unspecified thread.
+ * Use this method when the caller prefers to not be blocked by executing the
+ * `callback`.
+ * Note that this method does not provide any guarantees
+ * about when the `callback` will be executed (before returning to the caller,
+ * after that, or in parallel), the only thing that is guaranteed is that there
+ * is no synchronization.
+ */
+inline static void executeAsynchronously(
+    const RuntimeExecutor& runtimeExecutor,
+    std::function<void(jsi::Runtime& runtime)>&& callback) noexcept {
+  std::thread([callback = std::move(callback), runtimeExecutor]() mutable {
+    runtimeExecutor(std::move(callback));
+  }).detach();
+}
+
+/*
+ * Executes a `callback` in a *synchronous* manner using given
+ * `RuntimeExecutor`.
+ * Use this method when the caller needs to *be blocked* by executing the
+ * callback but does not concerned about the particular thread on which the
+ * `callback` will be executed.
+ */
+inline static void executeSynchronously_CAN_DEADLOCK(
+    const RuntimeExecutor& runtimeExecutor,
+    std::function<void(jsi::Runtime& runtime)>&& callback) noexcept {
+  std::mutex mutex;
+  mutex.lock();
+
+  runtimeExecutor(
+      [callback = std::move(callback), &mutex](jsi::Runtime& runtime) {
+        callback(runtime);
+        mutex.unlock();
+      });
+
+  mutex.lock();
+}
+
+/*
+ * Executes a `callback` in a *synchronous* manner on the same thread using
+ * given `RuntimeExecutor`.
+ * Use this method when the caller needs to *be blocked* by executing the
+ * `callback` and requires that the callback will be executed on the same
+ * thread.
+ */
+inline static void executeSynchronouslyOnSameThread_CAN_DEADLOCK(
+    const RuntimeExecutor& runtimeExecutor,
+    std::function<void(jsi::Runtime& runtime)>&& callback) noexcept {
+  // Note: We need the third mutex to get back to the main thread before
+  // the lambda is finished (because all mutexes are allocated on the stack).
+
+  std::mutex mutex1;
+  std::mutex mutex2;
+  std::mutex mutex3;
+
+  mutex1.lock();
+  mutex2.lock();
+  mutex3.lock();
+
+  jsi::Runtime* runtimePtr;
+
+  auto threadId = std::this_thread::get_id();
+
+  runtimeExecutor([&](jsi::Runtime& runtime) {
+    runtimePtr = &runtime;
+
+    if (threadId == std::this_thread::get_id()) {
+      // In case of a synchronous call, we should unlock mutexes and return.
+      mutex1.unlock();
+      mutex3.unlock();
+      return;
+    }
+
+    mutex1.unlock();
+    // `callback` is called somewhere here.
+    mutex2.lock();
+    mutex3.unlock();
+  });
+
+  mutex1.lock();
+  callback(*runtimePtr);
+  mutex2.unlock();
+  mutex3.lock();
+}
+
+template <typename DataT>
+inline static DataT executeSynchronouslyOnSameThread_CAN_DEADLOCK(
+    const RuntimeExecutor& runtimeExecutor,
+    std::function<DataT(jsi::Runtime& runtime)>&& callback) noexcept {
+  DataT data;
+
+  executeSynchronouslyOnSameThread_CAN_DEADLOCK(
+      runtimeExecutor,
+      [&](jsi::Runtime& runtime) { data = callback(runtime); });
+
+  return data;
+}
+} // namespace facebook::react