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/stacks/traefik/dynamic/gitea-ssh.yml

@@ -1,5 +1,7 @@
 # TCP Router Configuration for Gitea SSH
 # Routes SSH traffic on port 2222 to Gitea container
+# Note: Gitea SSH is handled via port mapping in docker-compose.yml
+# This file is kept for reference but may not be needed
 
 tcp:
   routers:
@@ -13,8 +15,5 @@ tcp:
     gitea-ssh-service:
       loadBalancer:
         servers:
-          # Gitea container SSH service
-          # Note: Using container IP from gitea_gitea-internal network
-          # Traefik runs in host network mode, so we need the actual container IP
-          # IP address: 172.23.0.3 (gitea_gitea-internal network)
-          - address: "172.23.0.3:22"
+          # Use container name in bridge network mode
+          - address: "gitea:22"