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.Tests/Infrastructure/JwtTokenHelper.cs

@@ -0,0 +1,65 @@
+using Microsoft.IdentityModel.Tokens;
+using System.IdentityModel.Tokens.Jwt;
+using System.Security.Claims;
+using System.Text;
+
+namespace LittleShop.Tests.Infrastructure;
+
+public static class JwtTokenHelper
+{
+    public static string GenerateJwtToken(
+        string userId = "test-user-id",
+        string username = "testuser",
+        string role = "User",
+        int expirationMinutes = 60,
+        string secretKey = "YourSuperSecretKeyThatIsAtLeast32CharactersLong!",
+        string issuer = "LittleShop",
+        string audience = "LittleShop")
+    {
+        var tokenHandler = new JwtSecurityTokenHandler();
+        var key = Encoding.ASCII.GetBytes(secretKey);
+        
+        var claims = new List<Claim>
+        {
+            new Claim(ClaimTypes.NameIdentifier, userId),
+            new Claim(ClaimTypes.Name, username),
+            new Claim(ClaimTypes.Role, role)
+        };
+
+        var tokenDescriptor = new SecurityTokenDescriptor
+        {
+            Subject = new ClaimsIdentity(claims),
+            Expires = DateTime.UtcNow.AddMinutes(expirationMinutes),
+            Issuer = issuer,
+            Audience = audience,
+            SigningCredentials = new SigningCredentials(
+                new SymmetricSecurityKey(key), 
+                SecurityAlgorithms.HmacSha256Signature)
+        };
+
+        var token = tokenHandler.CreateToken(tokenDescriptor);
+        return tokenHandler.WriteToken(token);
+    }
+
+    public static string GenerateExpiredJwtToken(
+        string userId = "test-user-id",
+        string username = "testuser",
+        string role = "User")
+    {
+        return GenerateJwtToken(userId, username, role, expirationMinutes: -60);
+    }
+
+    public static string GenerateInvalidJwtToken()
+    {
+        // Generate token with wrong secret key
+        return GenerateJwtToken(secretKey: "WrongSecretKeyThatIsAtLeast32CharactersLong!");
+    }
+
+    public static string GenerateAdminJwtToken()
+    {
+        return GenerateJwtToken(
+            userId: "admin-user-id",
+            username: "admin",
+            role: "Admin");
+    }
+}