Refactor payment verification to manual workflow and add comprehensive cleanup tools

Major changes:
• Remove BTCPay Server integration in favor of SilverPAY manual verification
• Add test data cleanup mechanisms (API endpoints and shell scripts)
• Fix compilation errors in TestController (IdentityReference vs CustomerIdentity)
• Add deployment automation scripts for Hostinger VPS
• Enhance integration testing with comprehensive E2E validation
• Add Blazor components and mobile-responsive CSS for admin interface
• Create production environment configuration scripts

Key Features Added:
• Manual payment verification through Admin panel Order Details
• Bulk test data cleanup with proper cascade handling
• Deployment automation with systemd service configuration
• Comprehensive E2E testing suite with SilverPAY integration validation
• Mobile-first admin interface improvements

Security & Production:
• Environment variable configuration for production secrets
• Proper JWT and VAPID key management
• SilverPAY API integration with live credentials
• Database cleanup and maintenance tools

🤖 Generated with Claude Code

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

LittleShop/wwwroot/js/blazor-integration.js

@@ -0,0 +1,15 @@
+// Blazor Server Integration Script
+document.addEventListener('DOMContentLoaded', function() {
+    // Check if we're on a page that should use Blazor
+    const blazorContainers = document.querySelectorAll('[data-blazor-component]');
+
+    if (blazorContainers.length > 0 || window.location.pathname.includes('/Admin/Products/Blazor')) {
+        // Start Blazor
+        Blazor.start();
+    }
+});
+
+// Helper function to navigate to Blazor components from MVC
+window.navigateToBlazor = function(componentPath) {
+    window.location.href = '/blazor#' + componentPath;
+};