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/yaml/dist/nodes/Node.d.ts

@@ -0,0 +1,53 @@
+import type { Document } from '../doc/Document';
+import type { ToJSOptions } from '../options';
+import type { Token } from '../parse/cst';
+import type { StringifyContext } from '../stringify/stringify';
+import type { Alias } from './Alias';
+import { NODE_TYPE } from './identity';
+import type { Scalar } from './Scalar';
+import type { ToJSContext } from './toJS';
+import type { MapLike, YAMLMap } from './YAMLMap';
+import type { YAMLSeq } from './YAMLSeq';
+export type Node<T = unknown> = Alias | Scalar<T> | YAMLMap<unknown, T> | YAMLSeq<T>;
+/** Utility type mapper */
+export type NodeType<T> = T extends string | number | bigint | boolean | null | undefined ? Scalar<T> : T extends Date ? Scalar<string | Date> : T extends Array<any> ? YAMLSeq<NodeType<T[number]>> : T extends {
+    [key: string]: any;
+} ? YAMLMap<NodeType<keyof T>, NodeType<T[keyof T]>> : T extends {
+    [key: number]: any;
+} ? YAMLMap<NodeType<keyof T>, NodeType<T[keyof T]>> : Node;
+export type ParsedNode = Alias.Parsed | Scalar.Parsed | YAMLMap.Parsed | YAMLSeq.Parsed;
+/** `[start, value-end, node-end]` */
+export type Range = [number, number, number];
+export declare abstract class NodeBase {
+    readonly [NODE_TYPE]: symbol;
+    /** A comment on or immediately after this */
+    comment?: string | null;
+    /** A comment before this */
+    commentBefore?: string | null;
+    /**
+     * The `[start, value-end, node-end]` character offsets for the part of the
+     * source parsed into this node (undefined if not parsed). The `value-end`
+     * and `node-end` positions are themselves not included in their respective
+     * ranges.
+     */
+    range?: Range | null;
+    /** A blank line before this node and its commentBefore */
+    spaceBefore?: boolean;
+    /** The CST token that was composed into this node.  */
+    srcToken?: Token;
+    /** A fully qualified tag, if required */
+    tag?: string;
+    /**
+     * Customize the way that a key-value pair is resolved.
+     * Used for YAML 1.1 !!merge << handling.
+     */
+    addToJSMap?: (ctx: ToJSContext | undefined, map: MapLike, value: unknown) => void;
+    /** A plain JS representation of this node */
+    abstract toJSON(): any;
+    abstract toString(ctx?: StringifyContext, onComment?: () => void, onChompKeep?: () => void): string;
+    constructor(type: symbol);
+    /** Create a copy of this node.  */
+    clone(): NodeBase;
+    /** A plain JavaScript representation of this node. */
+    toJS(doc: Document<Node, boolean>, { mapAsMap, maxAliasCount, onAnchor, reviver }?: ToJSOptions): any;
+}