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

deployment/README.md

@@ -68,6 +68,8 @@ Developer → git push
 
 ## Directory Structure
 
+### Local Repository Structure
+
 ```
 deployment/
 ├── ansible/                   # Ansible config, playbooks, inventory, templates
@@ -90,6 +92,22 @@ deployment/
 └── README.md (dieses Dokument)
 ```
 
+### Server Directory Structure
+
+Auf dem Production-Server existieren zwei Hauptverzeichnisse:
+
+```
+/home/deploy/
+├── deployment/          # Infrastructure-as-Code (24M)
+│   ├── stacks/         # Docker Compose Stacks
+│   └── backups/        # Backup-Dateien
+└── michaelschiemer/    # Application Code (491M)
+    ├── current/        # Symlink → Aktuelle deployed Version
+    └── .archive/       # Alte Versionen (Rollback)
+```
+
+**📖 Detaillierte Erklärung:** Siehe [docs/server-directory-structure.md](docs/server-directory-structure.md)
+
 ## Getting Started
 
 ### 🧪 Pipeline-Tests vorbereiten