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/Validators/CreateProductDtoValidator.cs

@@ -0,0 +1,26 @@
+using FluentValidation;
+using LittleShop.DTOs;
+
+namespace LittleShop.Validators;
+
+public class CreateProductDtoValidator : AbstractValidator<CreateProductDto>
+{
+    public CreateProductDtoValidator()
+    {
+        RuleFor(x => x.Name)
+            .NotEmpty().WithMessage("Product name is required")
+            .MaximumLength(200).WithMessage("Product name cannot exceed 200 characters");
+
+        RuleFor(x => x.Description)
+            .NotEmpty().WithMessage("Product description is required");
+
+        RuleFor(x => x.Price)
+            .GreaterThan(0).WithMessage("Price must be greater than 0");
+
+        RuleFor(x => x.Weight)
+            .GreaterThan(0).WithMessage("Weight must be greater than 0");
+
+        RuleFor(x => x.CategoryId)
+            .NotEmpty().WithMessage("Category is required");
+    }
+}