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/postgresql-production/scripts/restore.sh

@@ -0,0 +1,55 @@
+#!/bin/sh
+set -e
+
+# Configuration
+BACKUP_DIR="/backups"
+
+if [ -z "$1" ]; then
+  echo "Usage: ./restore.sh <backup-file>"
+  echo ""
+  echo "Available backups:"
+  ls -lh "${BACKUP_DIR}"/postgres_*.sql.gz 2>/dev/null || echo "No backups found"
+  exit 1
+fi
+
+BACKUP_FILE="$1"
+
+if [ ! -f "${BACKUP_FILE}" ]; then
+  echo "❌ Backup file not found: ${BACKUP_FILE}"
+  exit 1
+fi
+
+echo "======================================"
+echo "PostgreSQL Restore - $(date)"
+echo "======================================"
+echo "📦 Backup file: ${BACKUP_FILE}"
+echo ""
+
+# Wait for PostgreSQL to be ready
+until PGPASSWORD="${POSTGRES_PASSWORD}" pg_isready -h "${POSTGRES_HOST}" -U "${POSTGRES_USER}" -d postgres; do
+  echo "⏳ Waiting for PostgreSQL..."
+  sleep 5
+done
+
+echo "✅ PostgreSQL is ready"
+echo ""
+
+# Warning
+echo "⚠️  WARNING: This will DROP and RECREATE the database!"
+echo "⚠️  Database: ${POSTGRES_DB}"
+echo ""
+echo "Press Ctrl+C to cancel, or wait 10 seconds to continue..."
+sleep 10
+
+echo ""
+echo "🔄 Restoring database..."
+
+# Restore backup
+gunzip -c "${BACKUP_FILE}" | PGPASSWORD="${POSTGRES_PASSWORD}" psql \
+  -h "${POSTGRES_HOST}" \
+  -U "${POSTGRES_USER}" \
+  -d postgres
+
+echo ""
+echo "✅ Database restored successfully"
+echo "======================================"