feat: Complete architectural overhaul and enterprise refactoring

- Migrate backend to NestJS architecture
- Implement JWT and Google OAuth2 authentication
- Integrate Swagger, Helmet, and Compression in backend
- Add Dockerfiles and docker-compose.yml
- Refactor frontend to use NgRx and Signals
- Remove mock data and connect to real API
- Set up Vitest and Playwright for frontend testing

Co-authored-by: beginwebdev2002 <102213457+beginwebdev2002@users.noreply.github.com>

Author: google-labs-jules[bot]

README.md

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+# Mavluda Beauty - Full Stack Application
+
+## Overview
+This is a full-stack application for Mavluda Beauty. The backend is built with NestJS and provides a robust, modular API. The frontend is built with Angular 19+ and features a modern, reactive UI using Signals and NgRx.
+
+## Architecture
+
+The system consists of three main components:
+1.  **Frontend (Angular):** Handles user interactions, displaying the catalog, gallery, and admin dashboard.
+2.  **Backend (NestJS):** Provides RESTful API endpoints, business logic, authentication, and database interactions.
+3.  **Database (MongoDB):** Stores all persistent data, such as users, treatments, veils, and gallery items.
+4.  **Cache (Redis):** Used for session management and caching where appropriate.
+
+```mermaid
+graph TD
+    Client[Client Browser/Angular App] -->|HTTP/REST| API[NestJS Backend API]
+    API -->|Mongoose| MongoDB[(MongoDB Database)]
+    API -->|Redis Client| Redis[(Redis Cache)]
+```
+
+## Setup & Running
+
+### Docker (Recommended)
+You can run the entire stack using Docker Compose:
+
+```bash
+docker-compose up --build
+```
+This will start the Frontend (port 80), Backend (port 3000), MongoDB, and Redis.
+
+### Local Development
+
+**Backend:**
+1. Navigate to the `backend` directory.
+2. `npm install`
+3. Copy `.env.example` to `.env` and fill in the required values (or use defaults).
+4. `npm run start:dev`
+
+**Frontend:**
+1. Navigate to the `frontend` directory.
+2. `npm install`
+3. `npm run dev`
+
+## API Documentation
+The backend exposes a Swagger UI for API documentation. When the backend is running, you can access it at:
+`http://localhost:3000/api/docs`
+
+## Features
+
+- **Authentication:** JWT and Google OAuth strategies using Passport.js.
+- **Admin Panel:** Secured routes for managing content.
+- **Catalog:** Display veils and treatments with optimized images (`NgOptimizedImage`).
+- **State Management:** Uses NgRx and Signals.
+- **Testing:** Vitest for frontend unit tests, Jest for backend, and Playwright for E2E testing.

backend/Dockerfile

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+# Stage 1: Build the NestJS app
+FROM node:22-alpine AS build
+WORKDIR /app
+COPY package*.json ./
+RUN npm install
+COPY . .
+RUN npm run build
+
+# Stage 2: Run the app
+FROM node:22-alpine
+WORKDIR /app
+COPY package*.json ./
+RUN npm install --only=production
+COPY --from=build /app/dist ./dist
+EXPOSE 3000
+CMD ["node", "dist/main.js"]