fix: Gitea Traefik routing and connection pool optimization

- Remove middleware reference from Gitea Traefik labels (caused routing issues)
- Optimize Gitea connection pool settings (MAX_IDLE_CONNS=30, authentication_timeout=180s)
- Add explicit service reference in Traefik labels
- Fix intermittent 504 timeouts by improving PostgreSQL connection handling

Fixes Gitea unreachability via git.michaelschiemer.de

src/Framework/ExceptionHandling/Metrics/ExceptionMetrics.php

@@ -0,0 +1,43 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Framework\ExceptionHandling\Metrics;
+
+/**
+ * Exception Metrics
+ *
+ * Immutable value object for exception metrics.
+ */
+final readonly class ExceptionMetrics
+{
+    /**
+     * @param int $totalCount Total exception count
+     * @param array<string, int> $byClass Count by exception class
+     * @param array<string, int> $byComponent Count by component
+     * @param float $averageExecutionTimeMs Average execution time in milliseconds
+     */
+    public function __construct(
+        public int $totalCount = 0,
+        public array $byClass = [],
+        public array $byComponent = [],
+        public float $averageExecutionTimeMs = 0.0
+    ) {
+    }
+
+    /**
+     * Convert to array for serialization
+     *
+     * @return array<string, mixed>
+     */
+    public function toArray(): array
+    {
+        return [
+            'total_count' => $this->totalCount,
+            'by_class' => $this->byClass,
+            'by_component' => $this->byComponent,
+            'average_execution_time_ms' => $this->averageExecutionTimeMs,
+        ];
+    }
+}
+