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/React/React-RCTFabric.podspec

@@ -0,0 +1,103 @@
+# 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+  # This is an unpublished version, use the latest commit hash of the react-native repo, which we’re presumably in.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'
+new_arch_flags = ENV['RCT_NEW_ARCH_ENABLED'] == '1' ? ' -DRCT_NEW_ARCH_ENABLED=1' : ''
+
+header_search_paths = [
+  "\"$(PODS_TARGET_SRCROOT)/ReactCommon\"",
+  "\"$(PODS_ROOT)/boost\"",
+  "\"$(PODS_ROOT)/DoubleConversion\"",
+  "\"$(PODS_ROOT)/fmt/include\"",
+  "\"$(PODS_ROOT)/RCT-Folly\"",
+  "\"$(PODS_ROOT)/Headers/Private/React-Core\"",
+  "\"$(PODS_ROOT)/Headers/Private/Yoga\"",
+  "\"$(PODS_ROOT)/Headers/Public/React-Codegen\"",
+]
+
+if ENV['USE_FRAMEWORKS']
+  create_header_search_path_for_frameworks("React-RCTFabric", :framework_name => "RCTFabric")
+    .each { |search_path| header_search_paths << "\"#{search_path}\""}
+end
+
+module_name = "RCTFabric"
+header_dir = "React"
+
+Pod::Spec.new do |s|
+  s.name                   = "React-RCTFabric"
+  s.version                = version
+  s.summary                = "RCTFabric for React Native."
+  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           = "Fabric/**/*.{c,h,m,mm,S,cpp}"
+  s.exclude_files          = "**/tests/*",
+                             "**/android/*",
+  s.compiler_flags         = folly_compiler_flags + ' ' + boost_compiler_flags + new_arch_flags
+  s.header_dir             = header_dir
+  s.module_name            = module_name
+  s.framework              = ["JavaScriptCore", "MobileCoreServices"]
+  s.pod_target_xcconfig    = {
+    "HEADER_SEARCH_PATHS" => header_search_paths,
+    "OTHER_CFLAGS" => "$(inherited) " + folly_compiler_flags + new_arch_flags,
+    "CLANG_CXX_LANGUAGE_STANDARD" => "c++20"
+  }.merge!(ENV['USE_FRAMEWORKS'] != nil ? {
+    "PUBLIC_HEADERS_FOLDER_PATH" => "#{module_name}.framework/Headers/#{header_dir}"
+  }: {})
+
+  s.dependency "React-Core"
+  s.dependency "React-RCTImage"
+  s.dependency "RCT-Folly/Fabric", folly_version
+  s.dependency "glog"
+  s.dependency "Yoga"
+  s.dependency "React-RCTText"
+  s.dependency "React-jsi"
+
+  add_dependency(s, "React-FabricImage")
+  add_dependency(s, "React-Fabric", :additional_framework_paths => [
+    "react/renderer/textlayoutmanager/platform/ios",
+    "react/renderer/components/textinput/platform/ios",
+    "react/renderer/components/view/platform/cxx",
+    "react/renderer/imagemanager/platform/ios",
+  ])
+  add_dependency(s, "React-nativeconfig")
+  add_dependency(s, "React-graphics", :additional_framework_paths => ["react/renderer/graphics/platform/ios"])
+  add_dependency(s, "React-ImageManager")
+  add_dependency(s, "React-featureflags")
+  add_dependency(s, "React-debug")
+  add_dependency(s, "React-utils")
+  add_dependency(s, "React-rendererdebug")
+  add_dependency(s, "React-runtimescheduler")
+  add_dependency(s, "React-jsinspector", :framework_name => 'jsinspector_modern')
+
+  if ENV["USE_HERMES"] == nil || ENV["USE_HERMES"] == "1"
+    s.dependency "hermes-engine"
+  else
+    s.dependency "React-jsc"
+  end
+
+  s.test_spec 'Tests' do |test_spec|
+    test_spec.source_files = "Tests/**/*.{mm}"
+    test_spec.framework = "XCTest"
+  end
+end