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/ErrorRenderer.php

@@ -1,8 +1,34 @@
 <?php
 
+declare(strict_types=1);
+
 namespace App\Framework\ExceptionHandling;
 
+use App\Framework\ExceptionHandling\Context\ExceptionContextProvider;
+
+/**
+ * Unified interface for error renderers
+ *
+ * All error renderers implement this interface, regardless of output format.
+ * - HTTP renderers return HttpResponse
+ * - CLI renderers return void (output directly to console)
+ */
 interface ErrorRenderer
 {
-    public function render(): void;
+    /**
+     * Check if this renderer can handle the given exception
+     */
+    public function canRender(\Throwable $exception): bool;
+
+    /**
+     * Render exception to appropriate output format
+     *
+     * @param \Throwable $exception Exception to render
+     * @param ExceptionContextProvider|null $contextProvider Optional context provider
+     * @return mixed HttpResponse for HTTP context, void for CLI context
+     */
+    public function render(
+        \Throwable $exception,
+        ?ExceptionContextProvider $contextProvider = null
+    ): mixed;
 }