docs: Add clear production deployment instructions for main branch

DEPLOY_PRODUCTION_SERVER.md

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+# Production Server Deployment Instructions
+
+## Quick Deploy on Server 10.0.0.240
+
+Since the repository has already been cloned, run these commands:
+
+```bash
+# Navigate to the project directory
+cd /root/maternal-app
+
+# Switch to the main branch (where all the code is)
+git checkout main
+git pull origin main
+
+# Make deployment script executable and run it
+chmod +x deploy-to-production.sh
+./deploy-to-production.sh
+```
+
+## What the Deployment Script Does
+
+1. **Installs System Dependencies**
+   - Node.js 20.x
+   - PM2 process manager
+   - Docker and Docker Compose
+   - PostgreSQL client tools
+
+2. **Sets Up Database**
+   - Connects to PostgreSQL at 10.0.0.207
+   - Creates parentflow database if needed
+   - Runs all migrations in sequence
+
+3. **Starts Services**
+   - Redis, MongoDB, MinIO via Docker Compose
+   - Backend API on port 3020 via PM2
+   - Frontend on port 3005 via PM2
+
+4. **Configures PM2**
+   - Sets up auto-restart on system reboot
+   - Saves PM2 configuration
+
+## Manual Commands if Needed
+
+### Check out the main branch:
+```bash
+git checkout main
+git pull origin main
+```
+
+### Start all services:
+```bash
+./start-production.sh
+```
+
+### Stop all services:
+```bash
+./stop-production.sh
+```
+
+### Check PM2 status:
+```bash
+pm2 status
+pm2 logs
+```
+
+### Check Docker services:
+```bash
+docker-compose -f docker-compose.production.yml ps
+docker-compose -f docker-compose.production.yml logs
+```
+
+## Important Notes
+
+- **Database**: PostgreSQL is on dedicated server 10.0.0.207 (not in Docker)
+- **Default branch issue**: The repository default branch is 'master' but all code is on 'main'
+- **Always use main branch**: Make sure to checkout main branch after cloning