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/Aggregation/DiscoveryWarning.php

@@ -0,0 +1,23 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Framework\ExceptionHandling\Aggregation;
+
+/**
+ * Single discovery warning entry with structured context data.
+ *
+ * @psalm-type WarningContext = array<string, mixed>
+ */
+final readonly class DiscoveryWarning
+{
+    /**
+     * @param WarningContext $context
+     */
+    public function __construct(
+        public string $message,
+        public array $context
+    ) {
+    }
+}
+