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/README.md

@@ -0,0 +1,30 @@
+# Documentation Index
+
+## Reference (Architecture & Setup)
+- [Architecture Overview](reference/architecture.md)
+- [Hardware Inventory](reference/hardware.md)
+- [Network Topology](reference/network.md)
+- [Setup Guide](reference/setup.md)
+- [Quick Reference](reference/quick-reference.md)
+
+## CODESYS
+- [CODESYS Configuration](codesys/codesys.md)
+- [CODESYS Export Guide](codesys/codesys-export-guide.md)
+- [CODESYS Project Analysis](codesys/codesys-analysis.md)
+- [CODESYS XML Analysis](codesys/codesys-xml-analysis.md)
+
+## Integration (Node-RED, MQTT, HA, Zigbee)
+- [Node-RED](integration/nodered.md)
+- [MQTT Broker](integration/mqtt.md)
+- [Home Assistant](integration/homeassistant.md)
+- [Zigbee2MQTT](integration/zigbee2mqtt.md)
+
+## Redesign (Structure & Implementation)
+- [Redesign Summary](redesign/redesign-summary.md) — **Start here for redesign**
+- [Light Naming Configuration](redesign/light-naming-configuration.md) — Configure lights per room
+- [Implementation Roadmap](redesign/redesign-implementation-roadmap.md)
+- [Structure Redesign Analysis](redesign/structure-redesign-analysis.md)
+- [Structure Comparison (Visual)](redesign/structure-comparison-visual.md)
+- [fb_switch Documentation](redesign/fb_switch-documentation.md)
+- [fb_switch Redesign Recommendation](redesign/fb_switch-redesign-recommendation.md)
+- [fb_switch Analysis Summary](redesign/fb_switch-analysis-summary.md)