Add pfSense backup utility and documentation

- Add backup-pfsense-config.sh script for automated config backups via SSH
- Auto-commits backups to git with timestamped filenames
- Includes validation, error handling, and troubleshooting guides
- Add scripts/README.md with detailed usage and crontab examples
- Add BACKUP-QUICKSTART.md for quick reference commands
- Update README.md to reference automated backup workflow
- Create backups/ directory structure

The script tests SSH connectivity successfully to pfSense.

pfsense.home.arpa/BACKUP-QUICKSTART.md

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+# Quick Backup Reference
+
+One-liner commands to backup your pfSense configuration.
+
+## Basic Commands
+
+```bash
+# Navigate to the pfsense folder
+cd /Users/kenjim/workspace/src/personal/appa-net/pfsense.home.arpa
+
+# Test SSH connection (no download)
+./scripts/backup-pfsense-config.sh --dry-run
+
+# Backup with auto-commit to git (default)
+./scripts/backup-pfsense-config.sh
+
+# Backup without auto-commit
+./scripts/backup-pfsense-config.sh -n
+
+# Backup from different host
+./scripts/backup-pfsense-config.sh 192.168.1.1
+```
+
+## Schedule Daily Backups
+
+Add to your crontab to run at 2 AM every day:
+
+```bash
+crontab -e
+```
+
+Then add this line:
+```cron
+0 2 * * * cd /Users/kenjim/workspace/src/personal/appa-net/pfsense.home.arpa && ./scripts/backup-pfsense-config.sh > /tmp/pfsense-backup.log 2>&1
+```
+
+Verify it was added:
+```bash
+crontab -l | grep backup-pfsense
+```
+
+## View Backups
+
+```bash
+# List all backups
+ls -lh backups/
+
+# Show latest backup
+ls -lh backups/ | tail -1
+
+# Check git history
+git log --oneline backups/
+
+# See what changed in latest backup
+git show HEAD:backups/
+```
+
+## Restore from Backup
+
+From pfSense WebUI:
+1. **Diagnostics → Backup & Restore**
+2. **Choose File** → select backup from `backups/` folder
+3. **Restore Configuration**
+4. Reboot when prompted
+
+---
+
+**Last Updated**: 2026-04-22