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/Application/Admin/ValueObjects/NavigationSection.php

@@ -24,7 +24,7 @@ final readonly class NavigationSection
         return new self(
             name: $data['section'] ?? $data['name'] ?? '',
             items: $items,
-            icon: $data['icon'] ?? null
+            icon: $data['icon'] ?? null // Can be string or Icon
         );
     }
 
@@ -37,7 +37,7 @@ final readonly class NavigationSection
                 fn (NavigationItem $item) => $item->toArray(),
                 $this->items
             ),
-            'icon' => $this->icon,
+            'icon' => $this->icon instanceof Icon ? $this->icon->toString() : $this->icon,
         ];
     }