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/v5/inputSource/BufferSource.js

@@ -0,0 +1,118 @@
+const Constants = {
+  space: 32,
+  tab: 9
+}
+class BufferSource{
+  constructor(bytesArr){
+    this.line = 1;
+    this.cols = 0;
+    this.buffer = bytesArr;
+    this.startIndex = 0;
+  }
+
+
+
+  readCh() {
+    return String.fromCharCode(this.buffer[this.startIndex++]);
+  }
+
+  readChAt(index) {
+    return String.fromCharCode(this.buffer[this.startIndex+index]);
+  }
+
+  readStr(n,from){
+    if(typeof from === "undefined") from = this.startIndex;
+    return this.buffer.slice(from, from + n).toString();
+  }
+
+  readUpto(stopStr) {
+    const inputLength = this.buffer.length;
+    const stopLength = stopStr.length;
+    const stopBuffer = Buffer.from(stopStr);
+
+    for (let i = this.startIndex; i < inputLength; i++) {
+        let match = true;
+        for (let j = 0; j < stopLength; j++) {
+            if (this.buffer[i + j] !== stopBuffer[j]) {
+                match = false;
+                break;
+            }
+        }
+
+        if (match) {
+            const result = this.buffer.slice(this.startIndex, i).toString();
+            this.startIndex = i + stopLength;
+            return result;
+        }
+    }
+
+    throw new Error(`Unexpected end of source. Reading '${stopStr}'`);
+}
+
+readUptoCloseTag(stopStr) { //stopStr: "</tagname"
+    const inputLength = this.buffer.length;
+    const stopLength = stopStr.length;
+    const stopBuffer = Buffer.from(stopStr);
+    let stopIndex = 0;
+    //0: non-matching, 1: matching stop string, 2: matching closing
+    let match = 0;
+
+    for (let i = this.startIndex; i < inputLength; i++) {
+        if(match === 1){//initial part matched
+            if(stopIndex === 0) stopIndex = i;
+            if(this.buffer[i] === Constants.space || this.buffer[i] === Constants.tab) continue;
+            else if(this.buffer[i] === '>'){ //TODO: if it should be equivalent ASCII
+                match = 2;
+                //tag boundary found
+                // this.startIndex
+            }
+        }else{
+            match = 1;
+            for (let j = 0; j < stopLength; j++) {
+                if (this.buffer[i + j] !== stopBuffer[j]) {
+                    match = 0;
+                    break;
+                }
+            }
+        }
+        if (match === 2) {//matched closing part
+            const result = this.buffer.slice(this.startIndex, stopIndex - 1 ).toString();
+            this.startIndex = i + 1;
+            return result;
+        }
+    }
+
+    throw new Error(`Unexpected end of source. Reading '${stopStr}'`);
+}
+
+  readFromBuffer(n, shouldUpdate) {
+    let ch;
+    if (n === 1) {
+      ch = this.buffer[this.startIndex];
+      if (ch === 10) {
+        this.line++;
+        this.cols = 1;
+      } else {
+        this.cols++;
+      }
+      ch = String.fromCharCode(ch);
+    } else {
+      this.cols += n;
+      ch = this.buffer.slice(this.startIndex, this.startIndex + n).toString();
+    }
+    if (shouldUpdate) this.updateBuffer(n);
+    return ch;
+  }
+
+  updateBufferBoundary(n = 1) { //n: number of characters read
+    this.startIndex += n;
+  }
+
+  canRead(n){
+    n = n || this.startIndex;
+    return this.buffer.length - n + 1 > 0;
+  }
+  
+}
+
+module.exports = BufferSource;