Apply Composer changes: comprehensive API updates, migrations, middleware, and infrastructure improvements

- Add comprehensive database migrations (001-024) for schema evolution
- Enhance API schema with expanded type definitions and resolvers
- Add new middleware: audit logging, rate limiting, MFA enforcement, security, tenant auth
- Implement new services: AI optimization, billing, blockchain, compliance, marketplace
- Add adapter layer for cloud integrations (Cloudflare, Kubernetes, Proxmox, storage)
- Update Crossplane provider with enhanced VM management capabilities
- Add comprehensive test suite for API endpoints and services
- Update frontend components with improved GraphQL subscriptions and real-time updates
- Enhance security configurations and headers (CSP, CORS, etc.)
- Update documentation and configuration files
- Add new CI/CD workflows and validation scripts
- Implement design system improvements and UI enhancements

portal/src/components/dashboard/BillingTile.tsx

@@ -0,0 +1,67 @@
+'use client';
+
+import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/Card';
+import { CreditCard, FileText } from 'lucide-react';
+import Link from 'next/link';
+
+export function BillingTile() {
+  // Mock data - in production, this would come from API
+  const billing = {
+    currentInvoice: 45230,
+    nextBillingDate: '2024-02-15',
+    paymentMethod: 'Credit Card ending in 4242',
+    invoicesPending: 0,
+  };
+
+  return (
+    <Card className="bg-gray-800 border-gray-700">
+      <CardHeader>
+        <CardTitle className="text-white flex items-center gap-2">
+          <CreditCard className="h-5 w-5 text-orange-500" />
+          Billing & Invoices
+        </CardTitle>
+      </CardHeader>
+      <CardContent>
+        <div className="space-y-4">
+          <div>
+            <p className="text-2xl font-bold text-white mb-1">
+              ${billing.currentInvoice.toLocaleString()}
+            </p>
+            <p className="text-sm text-gray-400">Current Invoice</p>
+          </div>
+          
+          <div className="p-3 bg-gray-900 rounded-lg">
+            <p className="text-xs text-gray-400 mb-1">Next Billing Date</p>
+            <p className="text-sm font-semibold text-white">
+              {new Date(billing.nextBillingDate).toLocaleDateString()}
+            </p>
+          </div>
+
+          <div className="p-3 bg-gray-900 rounded-lg">
+            <p className="text-xs text-gray-400 mb-1">Payment Method</p>
+            <p className="text-sm text-white">{billing.paymentMethod}</p>
+          </div>
+
+          {billing.invoicesPending > 0 && (
+            <div className="p-3 bg-yellow-500/10 border border-yellow-500/20 rounded-lg">
+              <div className="flex items-center gap-2">
+                <FileText className="h-4 w-4 text-yellow-400" />
+                <span className="text-sm text-yellow-400 font-semibold">
+                  {billing.invoicesPending} invoice{billing.invoicesPending > 1 ? 's' : ''} pending
+                </span>
+              </div>
+            </div>
+          )}
+
+          <Link 
+            href="/admin/billing"
+            className="block text-center text-sm text-orange-500 hover:text-orange-400 transition-colors"
+          >
+            View All Invoices →
+          </Link>
+        </div>
+      </CardContent>
+    </Card>
+  );
+}
+