Add pgAdmin service configuration and update environment variables in .env.example

.gitignore

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+# Environment variables
+.env
+.env.local
+.env.production
+.env.staging
+
+# Docker volumes and data
+data/
+volumes/
+**/data/
+**/volumes/
+
+# Logs
+logs/
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Dependency directories
+node_modules/
+
+# SSL certificates (if stored locally)
+certs/
+ssl/
+*.pem
+*.crt
+*.key
+
+# Backup files
+*.backup
+*.bak
+*.tmp
+
+# IDE and editor files
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# OS generated files
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db
+
+# Traefik specific
+acme.json
+traefik.log
+access.log
+
+# Database dumps
+*.sql
+*.dump
+
+# Temporary files
+*.temp
+*.cache
+
+# Docker override files (optional)
+docker-compose.override.yml