Implement complete e-commerce functionality with shipping and order management

Features Added:
- Standard e-commerce properties (Price, Weight, shipping fields)
- Order management with Create/Edit views and shipping information
- ShippingRates system for weight-based shipping calculations
- Comprehensive test coverage with JWT authentication tests
- Sample data seeder with 5 orders demonstrating full workflow
- Photo upload functionality for products
- Multi-cryptocurrency payment support (BTC, XMR, USDT, etc.)

Database Changes:
- Added ShippingRates table
- Added shipping fields to Orders (Name, Address, City, PostCode, Country)
- Renamed properties to standard names (BasePrice to Price, ProductWeight to Weight)
- Added UpdatedAt timestamps to models

UI Improvements:
- Added Create/Edit views for Orders
- Added ShippingRates management UI
- Updated navigation menu with Shipping option
- Enhanced Order Details view with shipping information

Sample Data:
- 3 Categories (Electronics, Clothing, Books)
- 5 Products with various prices
- 5 Shipping rates (Royal Mail options)
- 5 Orders in different statuses (Pending to Delivered)
- 3 Crypto payments demonstrating payment flow

Security:
- All API endpoints secured with JWT authentication
- No public endpoints - client apps must authenticate
- Privacy-focused design with minimal data collection

Generated with Claude Code

Co-Authored-By: Claude <noreply@anthropic.com>

LittleShop/DTOs/ProductDto.cs

@@ -0,0 +1,81 @@
+using System.ComponentModel.DataAnnotations;
+using LittleShop.Enums;
+
+namespace LittleShop.DTOs;
+
+public class ProductDto
+{
+    public Guid Id { get; set; }
+    public string Name { get; set; } = string.Empty;
+    public string Description { get; set; } = string.Empty;
+    public decimal Price { get; set; }
+    public decimal Weight { get; set; }
+    public ProductWeightUnit WeightUnit { get; set; }
+    public Guid CategoryId { get; set; }
+    public string CategoryName { get; set; } = string.Empty;
+    public DateTime CreatedAt { get; set; }
+    public DateTime UpdatedAt { get; set; }
+    public bool IsActive { get; set; }
+    public List<ProductPhotoDto> Photos { get; set; } = new();
+}
+
+public class ProductPhotoDto
+{
+    public Guid Id { get; set; }
+    public string FileName { get; set; } = string.Empty;
+    public string FilePath { get; set; } = string.Empty;
+    public string? AltText { get; set; }
+    public int SortOrder { get; set; }
+}
+
+public class CreateProductDto
+{
+    [Required]
+    [StringLength(200)]
+    public string Name { get; set; } = string.Empty;
+    
+    [Required]
+    public string Description { get; set; } = string.Empty;
+    
+    [Range(0.01, double.MaxValue)]
+    public decimal Price { get; set; }
+    
+    public decimal Weight { get; set; }
+    
+    public ProductWeightUnit WeightUnit { get; set; }
+    
+    [Required]
+    public Guid CategoryId { get; set; }
+}
+
+public class UpdateProductDto
+{
+    [StringLength(200)]
+    public string? Name { get; set; }
+    
+    public string? Description { get; set; }
+    
+    [Range(0.01, double.MaxValue)]
+    public decimal? Price { get; set; }
+    
+    public decimal? Weight { get; set; }
+    
+    public ProductWeightUnit? WeightUnit { get; set; }
+    
+    public Guid? CategoryId { get; set; }
+    
+    public bool? IsActive { get; set; }
+}
+
+public class CreateProductPhotoDto
+{
+    [Required]
+    public Guid ProductId { get; set; }
+    
+    [Required]
+    public string PhotoUrl { get; set; } = string.Empty;
+    
+    public string? AltText { get; set; }
+    
+    public int DisplayOrder { get; set; }
+}