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/fast-xml-parser/src/xmlparser/node2json.js

@@ -0,0 +1,113 @@
+'use strict';
+
+/**
+ * 
+ * @param {array} node 
+ * @param {any} options 
+ * @returns 
+ */
+function prettify(node, options){
+  return compress( node, options);
+}
+
+/**
+ * 
+ * @param {array} arr 
+ * @param {object} options 
+ * @param {string} jPath 
+ * @returns object
+ */
+function compress(arr, options, jPath){
+  let text;
+  const compressedObj = {};
+  for (let i = 0; i < arr.length; i++) {
+    const tagObj = arr[i];
+    const property = propName(tagObj);
+    let newJpath = "";
+    if(jPath === undefined) newJpath = property;
+    else newJpath = jPath + "." + property;
+
+    if(property === options.textNodeName){
+      if(text === undefined) text = tagObj[property];
+      else text += "" + tagObj[property];
+    }else if(property === undefined){
+      continue;
+    }else if(tagObj[property]){
+      
+      let val = compress(tagObj[property], options, newJpath);
+      const isLeaf = isLeafTag(val, options);
+
+      if(tagObj[":@"]){
+        assignAttributes( val, tagObj[":@"], newJpath, options);
+      }else if(Object.keys(val).length === 1 && val[options.textNodeName] !== undefined && !options.alwaysCreateTextNode){
+        val = val[options.textNodeName];
+      }else if(Object.keys(val).length === 0){
+        if(options.alwaysCreateTextNode) val[options.textNodeName] = "";
+        else val = "";
+      }
+
+      if(compressedObj[property] !== undefined && compressedObj.hasOwnProperty(property)) {
+        if(!Array.isArray(compressedObj[property])) {
+            compressedObj[property] = [ compressedObj[property] ];
+        }
+        compressedObj[property].push(val);
+      }else{
+        //TODO: if a node is not an array, then check if it should be an array
+        //also determine if it is a leaf node
+        if (options.isArray(property, newJpath, isLeaf )) {
+          compressedObj[property] = [val];
+        }else{
+          compressedObj[property] = val;
+        }
+      }
+    }
+    
+  }
+  // if(text && text.length > 0) compressedObj[options.textNodeName] = text;
+  if(typeof text === "string"){
+    if(text.length > 0) compressedObj[options.textNodeName] = text;
+  }else if(text !== undefined) compressedObj[options.textNodeName] = text;
+  return compressedObj;
+}
+
+function propName(obj){
+  const keys = Object.keys(obj);
+  for (let i = 0; i < keys.length; i++) {
+    const key = keys[i];
+    if(key !== ":@") return key;
+  }
+}
+
+function assignAttributes(obj, attrMap, jpath, options){
+  if (attrMap) {
+    const keys = Object.keys(attrMap);
+    const len = keys.length; //don't make it inline
+    for (let i = 0; i < len; i++) {
+      const atrrName = keys[i];
+      if (options.isArray(atrrName, jpath + "." + atrrName, true, true)) {
+        obj[atrrName] = [ attrMap[atrrName] ];
+      } else {
+        obj[atrrName] = attrMap[atrrName];
+      }
+    }
+  }
+}
+
+function isLeafTag(obj, options){
+  const { textNodeName } = options;
+  const propCount = Object.keys(obj).length;
+  
+  if (propCount === 0) {
+    return true;
+  }
+
+  if (
+    propCount === 1 &&
+    (obj[textNodeName] || typeof obj[textNodeName] === "boolean" || obj[textNodeName] === 0)
+  ) {
+    return true;
+  }
+
+  return false;
+}
+exports.prettify = prettify;