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/Areas/Admin/Controllers/UsersController.cs

@@ -0,0 +1,90 @@
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using LittleShop.Services;
+using LittleShop.DTOs;
+
+namespace LittleShop.Areas.Admin.Controllers;
+
+[Area("Admin")]
+[Authorize(Policy = "AdminOnly")]
+public class UsersController : Controller
+{
+    private readonly IAuthService _authService;
+
+    public UsersController(IAuthService authService)
+    {
+        _authService = authService;
+    }
+
+    public async Task<IActionResult> Index()
+    {
+        var users = await _authService.GetAllUsersAsync();
+        return View(users);
+    }
+
+    public IActionResult Create()
+    {
+        return View();
+    }
+
+    [HttpPost]
+    public async Task<IActionResult> Create(CreateUserDto model)
+    {
+        if (!ModelState.IsValid)
+        {
+            return View(model);
+        }
+
+        var user = await _authService.CreateUserAsync(model);
+        if (user == null)
+        {
+            ModelState.AddModelError("", "User with this username already exists");
+            return View(model);
+        }
+
+        return RedirectToAction(nameof(Index));
+    }
+
+    public async Task<IActionResult> Edit(Guid id)
+    {
+        var user = await _authService.GetUserByIdAsync(id);
+        if (user == null)
+        {
+            return NotFound();
+        }
+
+        var model = new UpdateUserDto
+        {
+            Username = user.Username,
+            IsActive = user.IsActive
+        };
+
+        ViewData["UserId"] = id;
+        return View(model);
+    }
+
+    [HttpPost]
+    public async Task<IActionResult> Edit(Guid id, UpdateUserDto model)
+    {
+        if (!ModelState.IsValid)
+        {
+            ViewData["UserId"] = id;
+            return View(model);
+        }
+
+        var success = await _authService.UpdateUserAsync(id, model);
+        if (!success)
+        {
+            return NotFound();
+        }
+
+        return RedirectToAction(nameof(Index));
+    }
+
+    [HttpPost]
+    public async Task<IActionResult> Delete(Guid id)
+    {
+        await _authService.DeleteUserAsync(id);
+        return RedirectToAction(nameof(Index));
+    }
+}