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/recast/example/add-braces

@@ -0,0 +1,44 @@
+#!/usr/bin/env node
+
+var recast = require("recast");
+var types = recast.types;
+var n = types.namedTypes;
+var b = types.builders;
+
+require("recast").run(function(ast, callback) {
+    recast.visit(ast, {
+        visitIfStatement: function(path) {
+            var stmt = path.node;
+            stmt.consequent = fix(stmt.consequent);
+
+            var alt = stmt.alternate;
+            if (!n.IfStatement.check(alt)) {
+                stmt.alternate = fix(alt);
+            }
+
+            this.traverse(path);
+        },
+
+        visitWhileStatement: visitLoop,
+        visitForStatement: visitLoop,
+        visitForInStatement: visitLoop
+    });
+
+    callback(ast);
+});
+
+function visitLoop(path) {
+    var loop = path.node;
+    loop.body = fix(loop.body);
+    this.traverse(path);
+}
+
+function fix(clause) {
+    if (clause) {
+        if (!n.BlockStatement.check(clause)) {
+            clause = b.blockStatement([clause]);
+        }
+    }
+
+    return clause;
+}

smart-app-city/frontend/node_modules/recast/example/generic-identity

@@ -0,0 +1,17 @@
+#!/usr/bin/env node
+
+// This script should reprint the contents of the given file without
+// reusing the original source, but with identical AST structure.
+
+var recast = require("recast");
+
+recast.run(function(ast, callback) {
+    recast.visit(ast, {
+        visitNode: function(path) {
+            this.traverse(path);
+            path.node.original = null;
+        }
+    });
+
+    callback(ast);
+});

smart-app-city/frontend/node_modules/recast/example/identity

@@ -0,0 +1,8 @@
+#!/usr/bin/env node
+
+// This script should echo the contents of the given file without
+// modification.
+
+require("recast").run(function(ast, callback) {
+    callback(ast);
+});

smart-app-city/frontend/node_modules/recast/example/to-while

@@ -0,0 +1,84 @@
+#!/usr/bin/env node
+
+// This script converts for and do-while loops into equivalent while loops.
+// Note that for-in statements are left unmodified, as they do not have a
+// simple analogy to while loops. Also note that labeled continue statements
+// are not correctly handled at this point, and will trigger an assertion
+// failure if encountered.
+
+var assert = require("assert");
+var recast = require("recast");
+var types = recast.types;
+var n = types.namedTypes;
+var b = types.builders;
+
+recast.run(function(ast, callback) {
+    recast.visit(ast, {
+        visitForStatement: function(path) {
+            var fst = path.node;
+
+            path.replace(
+                fst.init,
+                b.whileStatement(
+                    fst.test,
+                    insertBeforeLoopback(fst, fst.update)
+                )
+            );
+
+            this.traverse(path);
+        },
+
+        visitDoWhileStatement: function(path) {
+            var dwst = path.node;
+            return b.whileStatement(
+                b.literal(true),
+                insertBeforeLoopback(
+                    dwst,
+                    b.ifStatement(
+                        dwst.test,
+                        b.breakStatement()
+                    )
+                )
+            );
+        }
+    });
+
+    callback(ast);
+});
+
+function insertBeforeLoopback(loop, toInsert) {
+    var body = loop.body;
+
+    if (!n.Statement.check(toInsert)) {
+        toInsert = b.expressionStatement(toInsert);
+    }
+
+    if (n.BlockStatement.check(body)) {
+        body.body.push(toInsert);
+    } else {
+        body = b.blockStatement([body, toInsert]);
+        loop.body = body;
+    }
+
+    recast.visit(body, {
+        visitContinueStatement: function(path) {
+            var cst = path.node;
+
+            assert.equal(
+                cst.label, null,
+                "Labeled continue statements are not yet supported."
+            );
+
+            path.replace(toInsert, path.node);
+            return false;
+        },
+
+        // Do not descend into nested loops.
+        visitWhileStatement: function() {},
+        visitForStatement: function() {},
+        visitForInStatement: function() {},
+        visitDoWhileStatement: function() {}
+    });
+
+    return body;
+}