feat: add production deployment configs

- PM2 cluster mode (2 API workers + 1 Next.js)
- Nginx reverse proxy with SSL, rate limiting, security headers
- Automated backup script with daily/weekly rotation
- PostgreSQL production tuning script (300 connections, 4GB shared_buffers)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

scripts/tune-postgres.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+# PostgreSQL Production Tuning for Horux360
+# Server: 32GB RAM, 8 cores
+# Target: 50 tenants, PM2 cluster ×2
+#
+# Run once: sudo bash scripts/tune-postgres.sh
+
+set -euo pipefail
+
+echo "=== PostgreSQL Production Tuning ==="
+
+sudo -u postgres psql -c "ALTER SYSTEM SET max_connections = 300;"
+sudo -u postgres psql -c "ALTER SYSTEM SET shared_buffers = '4GB';"
+sudo -u postgres psql -c "ALTER SYSTEM SET work_mem = '16MB';"
+sudo -u postgres psql -c "ALTER SYSTEM SET effective_cache_size = '16GB';"
+sudo -u postgres psql -c "ALTER SYSTEM SET maintenance_work_mem = '512MB';"
+sudo -u postgres psql -c "ALTER SYSTEM SET checkpoint_completion_target = 0.9;"
+sudo -u postgres psql -c "ALTER SYSTEM SET wal_buffers = '64MB';"
+sudo -u postgres psql -c "ALTER SYSTEM SET random_page_cost = 1.1;"
+
+echo "Settings applied. Restarting PostgreSQL..."
+sudo systemctl restart postgresql
+
+echo "Verifying settings..."
+sudo -u postgres psql -c "SHOW max_connections; SHOW shared_buffers; SHOW work_mem;"
+
+echo "=== Done ==="