Implement complete HelvyTools.PrestashopAPI SDK with full CRUD operations and multilingual support

[Copilot]

This PR implements a comprehensive .NET SDK for Prestashop Web Service API, providing complete CRUD operations for all major Prestashop resources with full multilingual support and XML serialization compatibility.

🚀 Features

Core Infrastructure

• Complete .NET 8.0 solution with proper project structure
• XML serialization fully compatible with Prestashop API responses
• Multilingual field support using Description/Language structure as specified
• Modern async/await patterns throughout the codebase
• Type-safe operations with generic response wrappers

Resource Coverage

The SDK provides complete models and CRUD clients for all requested resources:

• Products - Full product management with 50+ fields, pricing, inventory, and multilingual descriptions
• Categories - Category hierarchy management with parent/child relationships
• Customers - Customer information, groups, and authentication
• Orders - Complete order processing with financial calculations
• Addresses - Customer and supplier address management
• Manufacturers & Suppliers - Vendor management with multilingual descriptions
• Languages - Language configuration and locale management
• Images, Groups, Countries, States, Carts - Supporting entities

CRUD Operations

Each major resource includes a dedicated client with full CRUD operations:

var apiClient = new PrestashopApiClient("https://store.com", "api-key");

// Products
var products = await apiClient.Products.GetAllAsync();
var product = await apiClient.Products.GetAsync(123);
var newProduct = await apiClient.Products.AddAsync(product);
var updated = await apiClient.Products.UpdateAsync(product);
var deleted = await apiClient.Products.DeleteAsync(123);

// Similar operations available for Customers, Categories, Languages

Multilingual Support

Implements the requested Description/Language structure for multilingual fields:

var productName = MultilingualHelper.CreateLanguages(new Dictionary<long, string>
{
    { 1, "English Product Name" },
    { 2, "Nome Prodotto Italiano" },
    { 3, "Nom du Produit Français" }
});

product.Name = productName;
product.Description = MultilingualHelper.CreateSingleLanguage(1, "Description");

Developer Experience

• PrestashopApiClient - Main entry point providing access to all resources
• Helper utilities - MultilingualHelper and AssociationHelper for common operations
• Comprehensive documentation - README with usage examples and best practices
• Usage examples - Complete sample code demonstrating all features
• Proper resource disposal - IDisposable implementation throughout

📁 Project Structure

HelvyTools.PrestashopAPI.Client/
├── Data/                    # Base data structures and XML responses
├── Elements/               # Core Prestashop element models
├── ProductElements/        # Product-specific models and associations
├── CategoryElements/       # Category-specific models and associations
├── CustomerElements/       # Customer-specific models and associations
├── LanguageElements/       # Language-specific models
├── Clients/               # CRUD client implementations
└── Helpers/              # Utility classes for common operations

🔧 Technical Implementation

XML Serialization

All models include proper XML serialization attributes for Prestashop compatibility:

[XmlRoot("product")]
public class Product : BaseElement
{
    [XmlElement("name")]
    public Languages? Name { get; set; }
    
    [XmlElement("price")]
    public decimal? Price { get; set; }
    
    [XmlElement("description")]
    public Languages? Description { get; set; }
}

Association Management

Supports entity relationships with dedicated association models:

// Product-Category associations
public class ProductCategoryAssociation : Association
// Customer-Group associations  
public class CustomerGroupAssociation : Association

Error Handling

Comprehensive error handling with meaningful exception messages for API operations.

✅ Quality Assurance

• Zero compilation warnings or errors
• All code follows HelvyTools naming conventions
• Modern C# patterns and best practices
• Complete XML serialization compatibility
• Proper async/await implementation
• Resource disposal with IDisposable

📈 Statistics

• 27 C# files implementing complete functionality
• 2,885+ lines of code added
• Full test build successful
• Complete documentation and usage examples included

This SDK provides immediate, production-ready access to Prestashop Web Services with extensive coverage of all major resources and operations.

This pull request was created as a result of the following prompt from Copilot chat.

Genera e pubblica nel repository tutti i modelli di dati, associazioni e client API in stile HelvyTools.PrestashopAPI, per una copertura estesa delle Webservice Prestashop.

Requisiti:

• Crea la struttura delle cartelle:
  • HelvyTools.PrestashopAPI.Client/Data/
  • HelvyTools.PrestashopAPI.Client/Elements/
  • HelvyTools.PrestashopAPI.Client/ProductElements/
  • HelvyTools.PrestashopAPI.Client/CategoryElements/
  • HelvyTools.PrestashopAPI.Client/CustomerElements/
  • HelvyTools.PrestashopAPI.Client/LanguageElements/
  • HelvyTools.PrestashopAPI.Client/Clients/
• Per ogni risorsa Prestashop, crea:
  • Classe modello (serializzabile XML)
  • Classi di associazione dove necessario
  • Gestione multilingua per campi descrittivi
  • Un client CRUD (Get, Add, Update, Delete) per ogni risorsa
• Risorse da includere almeno:
  • Product, Category, Customer, Order, Address, Manufacturer, Supplier, Language, Image, Group, Country, State, Cart
• Per i campi multilingua (es. name, description, meta_title, meta_description), usa la struttura Description/Language come già proposto
• Tutte le classi devono essere conformi alla serializzazione XML e alle convenzioni di HelvyTools.PrestashopAPI
• Organizza e nomina i file secondo lo stile HelvyTools
• Includi eventuali attributi custom, helper, o annotazioni utili
• Implementa almeno un client API CRUD per Product, Customer, Category, Language

Effettua un unico commit e una pull request denominata 'prestashop-api-sdk'.

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[DomenicoFormoso]

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