docs: Create quick start guide for AWS deployment

Author: bogdan-ts

terraform/aws/QUICKSTART.md

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+# Quick start
+
+## Prerequisites
+
+```bash
+# Create SSH key
+aws ec2 create-key-pair --key-name postgres-ai-key \
+  --query 'KeyMaterial' --output text > ~/.ssh/postgres-ai-key.pem
+chmod 400 ~/.ssh/postgres-ai-key.pem
+
+# Configure AWS credentials
+aws configure
+```
+
+## Deploy
+
+```bash
+cd terraform/aws
+
+# Configure
+cp terraform.tfvars.example terraform.tfvars
+vim terraform.tfvars  # Set ssh_key_name and grafana_password
+
+# Validate
+./validate.sh
+
+# Deploy
+terraform init
+terraform plan
+terraform apply
+
+# Get access info
+terraform output grafana_url
+terraform output ssh_command
+```
+
+## Access
+
+```bash
+# Grafana dashboard
+open $(terraform output -raw grafana_url)
+# Login: monitor / <your grafana_password>
+
+# SSH
+ssh -i ~/.ssh/postgres-ai-key.pem ubuntu@$(terraform output -raw public_ip)
+```
+
+## Add monitoring instances
+
+Edit `terraform.tfvars`:
+
+```hcl
+monitoring_instances = [
+  {
+    name        = "prod-db"
+    conn_str    = "postgresql://monitor:pass@db.example.com:5432/postgres"
+    environment = "production"
+    cluster     = "main"
+    node_name   = "primary"
+  }
+]
+```
+
+Apply changes:
+```bash
+terraform apply
+```
+
+## Operations
+
+```bash
+# View logs
+ssh ubuntu@IP "sudo cat /var/log/user-data.log"
+
+# Restart services
+ssh ubuntu@IP "sudo systemctl restart postgres-ai"
+
+# Create backup
+aws ec2 create-snapshot --volume-id $(terraform output -raw data_volume_id)
+
+# Destroy
+terraform destroy
+```
+
+## Troubleshooting
+
+```bash
+# Check installation log
+ssh ubuntu@IP "sudo cat /var/log/user-data.log"
+
+# Check service status
+ssh ubuntu@IP "sudo systemctl status postgres-ai"
+
+# Check containers
+ssh ubuntu@IP "sudo docker ps"
+```
+