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/Enums/CryptoCurrency.cs

@@ -0,0 +1,13 @@
+namespace LittleShop.Enums;
+
+public enum CryptoCurrency
+{
+    BTC = 0,
+    XMR = 1,
+    USDT = 2,
+    LTC = 3,
+    ETH = 4,
+    ZEC = 5,
+    DASH = 6,
+    DOGE = 7
+}

LittleShop/Enums/OrderStatus.cs

@@ -0,0 +1,13 @@
+namespace LittleShop.Enums;
+
+public enum OrderStatus
+{
+    PendingPayment = 0,
+    PaymentReceived = 1,
+    Processing = 2,
+    PickingAndPacking = 3,
+    Shipped = 4,
+    Delivered = 5,
+    Cancelled = 6,
+    Refunded = 7
+}

LittleShop/Enums/PaymentStatus.cs

@@ -0,0 +1,11 @@
+namespace LittleShop.Enums;
+
+public enum PaymentStatus
+{
+    Pending = 0,
+    PartiallyPaid = 1,
+    Paid = 2,
+    Overpaid = 3,
+    Expired = 4,
+    Cancelled = 5
+}

LittleShop/Enums/ProductWeightUnit.cs

@@ -0,0 +1,14 @@
+namespace LittleShop.Enums;
+
+public enum ProductWeightUnit
+{
+    Unit = 0,
+    Micrograms = 1,
+    Grams = 2,
+    Ounces = 3,
+    Pounds = 4,
+    Millilitres = 5,
+    Litres = 6,
+    Kilogram = 7,
+    Kilograms = 7  // Alias for compatibility with tests
+}