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/js-yaml/bin/js-yaml.js

@@ -0,0 +1,117 @@
+#!/usr/bin/env node
+
+'use strict'
+
+const fs = require('fs')
+const argparse = require('argparse')
+const yaml = require('..')
+
+/// /////////////////////////////////////////////////////////////////////////////
+
+const cli = new argparse.ArgumentParser({
+  prog: 'js-yaml',
+  add_help: true
+})
+
+cli.add_argument('-v', '--version', {
+  action: 'version',
+  version: require('../package.json').version
+})
+
+cli.add_argument('-c', '--compact', {
+  help: 'Display errors in compact mode',
+  action: 'store_true'
+})
+
+// deprecated (not needed after we removed output colors)
+// option suppressed, but not completely removed for compatibility
+cli.add_argument('-j', '--to-json', {
+  help: argparse.SUPPRESS,
+  dest: 'json',
+  action: 'store_true'
+})
+
+cli.add_argument('-t', '--trace', {
+  help: 'Show stack trace on error',
+  action: 'store_true'
+})
+
+cli.add_argument('file', {
+  help: 'File to read, utf-8 encoded without BOM',
+  nargs: '?',
+  default: '-'
+})
+
+/// /////////////////////////////////////////////////////////////////////////////
+
+const options = cli.parse_args()
+
+/// /////////////////////////////////////////////////////////////////////////////
+
+function readFile (filename, encoding, callback) {
+  if (options.file === '-') {
+    // read from stdin
+
+    const chunks = []
+
+    process.stdin.on('data', function (chunk) {
+      chunks.push(chunk)
+    })
+
+    process.stdin.on('end', function () {
+      return callback(null, Buffer.concat(chunks).toString(encoding))
+    })
+  } else {
+    fs.readFile(filename, encoding, callback)
+  }
+}
+
+readFile(options.file, 'utf8', function (error, input) {
+  let output
+  let isYaml
+
+  if (error) {
+    if (error.code === 'ENOENT') {
+      console.error('File not found: ' + options.file)
+      process.exit(2)
+    }
+
+    console.error(
+      (options.trace && error.stack) ||
+      error.message ||
+      String(error))
+
+    process.exit(1)
+  }
+
+  try {
+    output = JSON.parse(input)
+    isYaml = false
+  } catch (err) {
+    if (err instanceof SyntaxError) {
+      try {
+        output = []
+        yaml.loadAll(input, function (doc) { output.push(doc) }, {})
+        isYaml = true
+
+        if (output.length === 0) output = null
+        else if (output.length === 1) output = output[0]
+      } catch (e) {
+        if (options.trace && err.stack) console.error(e.stack)
+        else console.error(e.toString(options.compact))
+
+        process.exit(1)
+      }
+    } else {
+      console.error(
+        (options.trace && err.stack) ||
+        err.message ||
+        String(err))
+
+      process.exit(1)
+    }
+  }
+
+  if (isYaml) console.log(JSON.stringify(output, null, '  '))
+  else console.log(yaml.dump(output))
+})