feat(Production): Complete production deployment infrastructure

- Add comprehensive health check system with multiple endpoints
- Add Prometheus metrics endpoint
- Add production logging configurations (5 strategies)
- Add complete deployment documentation suite:
  * QUICKSTART.md - 30-minute deployment guide
  * DEPLOYMENT_CHECKLIST.md - Printable verification checklist
  * DEPLOYMENT_WORKFLOW.md - Complete deployment lifecycle
  * PRODUCTION_DEPLOYMENT.md - Comprehensive technical reference
  * production-logging.md - Logging configuration guide
  * ANSIBLE_DEPLOYMENT.md - Infrastructure as Code automation
  * README.md - Navigation hub
  * DEPLOYMENT_SUMMARY.md - Executive summary
- Add deployment scripts and automation
- Add DEPLOYMENT_PLAN.md - Concrete plan for immediate deployment
- Update README with production-ready features

All production infrastructure is now complete and ready for deployment.

src/Framework/ErrorAggregation/NullErrorAggregator.php

@@ -0,0 +1,41 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Framework\ErrorAggregation;
+
+use App\Framework\Exception\ErrorHandlerContext;
+
+/**
+ * Null Object implementation for ErrorAggregator
+ *
+ * Used when error aggregation is disabled or unavailable.
+ * All operations are no-ops that return empty/default values.
+ */
+final readonly class NullErrorAggregator implements ErrorAggregatorInterface
+{
+    public function processError(ErrorHandlerContext $context): void
+    {
+        // No-op: Error aggregation is disabled
+    }
+
+    public function getStatistics(\DateTimeImmutable $from, \DateTimeImmutable $to): array
+    {
+        return [
+            'total_events' => 0,
+            'total_patterns' => 0,
+            'by_severity' => [],
+            'by_service' => [],
+        ];
+    }
+
+    public function getActivePatterns(int $limit = 50, int $offset = 0): array
+    {
+        return [];
+    }
+
+    public function getRecentEvents(int $limit = 100, ?ErrorSeverity $severity = null): array
+    {
+        return [];
+    }
+}