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/production/.env.example

@@ -0,0 +1,48 @@
+# Application Stack Configuration
+# Copy this file to .env and adjust values
+
+# Timezone
+TZ=Europe/Berlin
+
+# Application Domain
+APP_DOMAIN=michaelschiemer.de
+
+# Application Settings
+APP_ENV=production
+APP_DEBUG=false
+APP_URL=https://michaelschiemer.de
+
+# Database Configuration
+# Note: Using PostgreSQL from postgres stack
+DB_HOST=postgres
+DB_PORT=5432
+DB_NAME=michaelschiemer
+DB_USER=appuser
+DB_PASS=<generate-with-openssl-rand-base64-32>
+
+# Redis Configuration
+# Generate password with: openssl rand -base64 32
+REDIS_PASSWORD=<generate-with-openssl-rand-base64-32>
+
+# Cache Configuration
+CACHE_DRIVER=redis
+CACHE_PREFIX=app
+
+# Session Configuration
+SESSION_DRIVER=redis
+SESSION_LIFETIME=120
+
+# Queue Worker Configuration
+QUEUE_DRIVER=redis
+QUEUE_CONNECTION=default
+QUEUE_WORKER_SLEEP=3
+QUEUE_WORKER_TRIES=3
+QUEUE_WORKER_TIMEOUT=60
+
+# Git Repository Configuration (optional - if set, container will clone/pull code on start)
+# Uncomment to enable Git-based deployment:
+# GIT_REPOSITORY_URL=https://git.michaelschiemer.de/michael/michaelschiemer.git
+# GIT_BRANCH=main
+# GIT_TOKEN=
+# GIT_USERNAME=
+# GIT_PASSWORD=