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/ReactCommon.podspec

@@ -0,0 +1,79 @@
+# 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+  # This is an unpublished version, use the latest commit hash of the react-native repo, which we’re presumably in.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'
+using_hermes = ENV['USE_HERMES'] == nil || ENV['USE_HERMES'] == "1"
+Pod::Spec.new do |s|
+  s.name                   = "ReactCommon"
+  s.module_name            = "ReactCommon"
+  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.header_dir             = "ReactCommon" # Use global header_dir for all subspecs for use_frameworks! compatibility
+  s.compiler_flags         = folly_compiler_flags + ' ' + boost_compiler_flags
+  s.pod_target_xcconfig    = { "HEADER_SEARCH_PATHS" => "\"$(PODS_ROOT)/boost\" \"$(PODS_ROOT)/RCT-Folly\" \"$(PODS_ROOT)/DoubleConversion\" \"$(PODS_ROOT)/fmt/include\" \"$(PODS_ROOT)/Headers/Private/React-Core\"",
+                               "USE_HEADERMAP" => "YES",
+                               "CLANG_CXX_LANGUAGE_STANDARD" => "c++20",
+                               "GCC_WARN_PEDANTIC" => "YES" }
+  if ENV['USE_FRAMEWORKS']
+    s.header_mappings_dir     = './'
+  end
+
+  # TODO (T48588859): Restructure this target to align with dir structure: "react/nativemodule/..."
+  # Note: Update this only when ready to minimize breaking changes.
+  s.subspec "turbomodule" do |ss|
+    ss.dependency "React-callinvoker", version
+    ss.dependency "React-perflogger", version
+    ss.dependency "React-cxxreact", version
+    ss.dependency "React-jsi", version
+    ss.dependency "RCT-Folly", folly_version
+    ss.dependency "React-logger", version
+    ss.dependency "DoubleConversion"
+    ss.dependency "fmt", "9.1.0"
+    ss.dependency "glog"
+    if using_hermes
+      ss.dependency "hermes-engine"
+    end
+
+    ss.subspec "bridging" do |sss|
+      sss.dependency           "React-jsi", version
+      sss.source_files         = "react/bridging/**/*.{cpp,h}"
+      sss.exclude_files        = "react/bridging/tests"
+      sss.header_dir           = "react/bridging"
+      sss.pod_target_xcconfig  = { "HEADER_SEARCH_PATHS" => "\"$(PODS_TARGET_SRCROOT)/ReactCommon\" \"$(PODS_ROOT)/RCT-Folly\"" }
+      if using_hermes
+        sss.dependency "hermes-engine"
+      end
+    end
+
+    ss.subspec "core" do |sss|
+      sss.source_files = "react/nativemodule/core/ReactCommon/**/*.{cpp,h}"
+      sss.pod_target_xcconfig  = { "HEADER_SEARCH_PATHS" => "\"$(PODS_TARGET_SRCROOT)/ReactCommon\" \"$(PODS_CONFIGURATION_BUILD_DIR)/React-debug/React_debug.framework/Headers\" \"$(PODS_CONFIGURATION_BUILD_DIR)/React-utils/React_utils.framework/Headers\"" }
+      sss.dependency "React-debug", version
+      sss.dependency "React-utils", version
+    end
+  end
+end