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/dayjs/locale/bn-bd.js

@@ -0,0 +1 @@
+!function(e,t){"object"==typeof exports&&"undefined"!=typeof module?module.exports=t(require("dayjs")):"function"==typeof define&&define.amd?define(["dayjs"],t):(e="undefined"!=typeof globalThis?globalThis:e||self).dayjs_locale_bn_bd=t(e.dayjs)}(this,(function(e){"use strict";function t(e){return e&&"object"==typeof e&&"default"in e?e:{default:e}}var _=t(e),n={1:"১",2:"২",3:"৩",4:"৪",5:"৫",6:"৬",7:"৭",8:"৮",9:"৯",0:"০"},d={"১":"1","২":"2","৩":"3","৪":"4","৫":"5","৬":"6","৭":"7","৮":"8","৯":"9","০":"0"},r={name:"bn-bd",weekdays:"রবিবার_সোমবার_মঙ্গলবার_বুধবার_বৃহস্পতিবার_শুক্রবার_শনিবার".split("_"),months:"জানুয়ারি_ফেব্রুয়ারি_মার্চ_এপ্রিল_মে_জুন_জুলাই_আগস্ট_সেপ্টেম্বর_অক্টোবর_নভেম্বর_ডিসেম্বর".split("_"),weekdaysShort:"রবি_সোম_মঙ্গল_বুধ_বৃহস্পতি_শুক্র_শনি".split("_"),monthsShort:"জানু_ফেব্রু_মার্চ_এপ্রিল_মে_জুন_জুলাই_আগস্ট_সেপ্ট_অক্টো_নভে_ডিসে".split("_"),weekdaysMin:"রবি_সোম_মঙ্গ_বুধ_বৃহঃ_শুক্র_শনি".split("_"),weekStart:0,preparse:function(e){return e.replace(/[১২৩৪৫৬৭৮৯০]/g,(function(e){return d[e]}))},postformat:function(e){return e.replace(/\d/g,(function(e){return n[e]}))},ordinal:function(e){var t=["ই","লা","রা","ঠা","শে"],_=e%100;return"["+e+(t[(_-20)%10]||t[_]||t[0])+"]"},formats:{LT:"A h:mm সময়",LTS:"A h:mm:ss সময়",L:"DD/MM/YYYY খ্রিস্টাব্দ",LL:"D MMMM YYYY খ্রিস্টাব্দ",LLL:"D MMMM YYYY খ্রিস্টাব্দ, A h:mm সময়",LLLL:"dddd, D MMMM YYYY খ্রিস্টাব্দ, A h:mm সময়"},meridiem:function(e){return e<4?"রাত":e<6?"ভোর":e<12?"সকাল":e<15?"দুপুর":e<18?"বিকাল":e<20?"সন্ধ্যা":"রাত"},relativeTime:{future:"%s পরে",past:"%s আগে",s:"কয়েক সেকেন্ড",m:"এক মিনিট",mm:"%d মিনিট",h:"এক ঘন্টা",hh:"%d ঘন্টা",d:"এক দিন",dd:"%d দিন",M:"এক মাস",MM:"%d মাস",y:"এক বছর",yy:"%d বছর"}};return _.default.locale(r,null,!0),r}));