Initial commit: Home automation docs and CODESYS project

- Reorganized project: codesys/, docs/codesys|redesign|integration|reference/, scripts/
- CODESYS project and exports in codesys/
- Documentation index in docs/README.md
- Redesign and light naming configuration
- Water boiler control and safety design

Co-authored-by: Cursor <cursoragent@cursor.com>

docs/reference/network.md

@@ -0,0 +1,89 @@
+# Network Topology
+
+## Overview
+
+This document describes the network configuration and topology of the home automation system.
+
+## Network Diagram
+
+```
+[To be created with actual IP addresses]
+```
+
+## IP Address Assignments
+
+| Device/Service | IP Address | MAC Address | Hostname | Notes |
+|----------------|------------|-------------|----------|-------|
+| Raspberry Pi (CODESYS) | [To be filled] | [To be filled] | [To be filled] | |
+| Node-RED Host | [To be filled] | [To be filled] | [To be filled] | |
+| MQTT Broker (LXC) | [To be filled] | [To be filled] | [To be filled] | |
+| Zigbee2MQTT Host | [To be filled] | [To be filled] | [To be filled] | |
+| Home Assistant | [To be filled] | [To be filled] | [To be filled] | |
+
+## Network Segments
+
+### Subnets
+
+- **Main Network**: [Subnet/CIDR]
+- **IoT Network**: [If separate VLAN/subnet]
+- **Management Network**: [If separate]
+
+### VLANs
+
+[If VLANs are used]
+
+## Port Assignments
+
+| Service | Protocol | Port | Access | Notes |
+|---------|----------|------|--------|-------|
+| MQTT | TCP | 1883 | Internal | |
+| MQTT TLS | TCP | 8883 | Internal | If enabled |
+| Node-RED | HTTP | [Port] | [Access] | |
+| Home Assistant | HTTP | [Port] | [Access] | |
+| CODESYS | [Protocol] | [Port] | [Access] | |
+| Zigbee2MQTT | HTTP | [Port] | [Access] | |
+
+## Firewall Rules
+
+[Document firewall rules if applicable]
+
+## DNS
+
+- **Internal DNS**: [If used]
+- **Hostname Resolution**: [How devices find each other]
+
+## Routing
+
+[If complex routing is involved]
+
+## Network Services
+
+### DHCP
+
+- **DHCP Server**: [To be filled]
+- **Reserved IPs**: [List if static IPs are reserved]
+
+### DNS
+
+- **DNS Servers**: [To be filled]
+
+## Security
+
+- **Network Isolation**: [To be filled]
+- **VPN Access**: [If applicable]
+- **Remote Access**: [How remote access is configured]
+
+## Troubleshooting
+
+### Network Connectivity
+
+- **Ping Tests**: [How to test connectivity]
+- **Port Checks**: [How to verify ports are open]
+
+### Common Issues
+
+- [Issue]: [Solution]
+
+---
+
+**Status**: Template - needs IP addresses and network details