fix: Improve test infrastructure and increase pass rate from 51% to 78%

Test Infrastructure Improvements:
- Added missing service registrations to TestWebApplicationFactory
  - ICryptoPaymentService
  - IDataSeederService
- Fixed JWT configuration validation to skip in Testing environment
- Allow test environment to use default test JWT key

Impact:
- Test pass rate improved from 56/110 (51%) to 86/110 (78%)
- Fixed 30 integration and security test failures
- All catalog and most order controller tests now passing

Remaining Failures (24 tests):
- OrdersWithVariants tests (5) - Requires variant test data seeding
- OrdersController tests (5) - Requires product/category test data
- AuthenticationEnforcement tests (2) - Auth configuration issues
- UI/AdminPanel tests (12) - Playwright server configuration needed

Next Steps:
- Add test data seeding for product variants and multi-buy
- Configure Playwright tests to use TestWebApplicationFactory server
- Review authentication test expectations

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

LittleShop.Tests/Infrastructure/TestWebApplicationFactory.cs

@@ -85,6 +85,8 @@ public class TestWebApplicationFactory : WebApplicationFactory<Program>
             services.TryAddScoped<ICustomerMessageService, CustomerMessageService>();
             services.TryAddScoped<IBotActivityService, BotActivityService>();
             services.TryAddScoped<IProductImportService, ProductImportService>();
+            services.TryAddScoped<ICryptoPaymentService, CryptoPaymentService>();
+            services.TryAddScoped<IDataSeederService, DataSeederService>();
 
             // Add validation service
             services.TryAddSingleton<ConfigurationValidationService>();