Refactor room and light configurations for Node-RED integration

- Updated global variable lists in GVL_IO.gvl and GVL_NVL_placeholders.gvl to reflect new room naming conventions and structures.
- Revised PLC_App.st to map new room configurations for lighting control.
- Enhanced documentation in all-lights-and-rooms.md and ha-lights-and-rooms.md to align with updated room and light entity naming.
- Adjusted room-config.js and related Node-RED flows to support the new configuration structure.

This update improves the organization and clarity of room and light management within the Node-RED integration, ensuring consistency across the system.

docs/Electrical/validation_report.md

@@ -0,0 +1,37 @@
+# Validation report (uniform lighting naming migration)
+
+## Static consistency checks completed
+
+- Canonical lighting rows: `39` (`lights_zones_canonical.csv`)
+- CODESYS `NVL_In` room structs: `16`
+- CODESYS `NVL_Out` room structs: `16`
+- Node-RED `roomNames` entries: `16`
+- Node-RED `lightEntityMap` entries: `39`
+
+## Mapping status
+
+- `circuit_no -> area/room/type/index/light_no` is defined for all non-empty circuits.
+- `codesys_in_key` / `codesys_out_key` are defined for every canonical row.
+- `room-config.js` is aligned with canonical keys:
+  - `roomNames` matches the 16-room CODESYS layout.
+  - `lightEntityMap` has one entry per canonical row.
+  - `entityToRoom` base keys map all canonical HA entity patterns.
+
+## Verified constraints
+
+- Canonical naming style: `snake_case`
+- Entity ID pattern: `input_boolean.<area>_<room>_<light_type>_<index>`
+- CODESYS legacy room names replaced in `codesys/src` runtime files:
+  - `GVL_NVL_placeholders.gvl`
+  - `GVL_IO.gvl`
+  - `PLC_App.st`
+
+## Residual runtime checks to perform on target system
+
+Because this repository environment has no runtime binaries for Node-RED/CODESYS/HA validation, perform these on your deployed setup:
+
+1. Deploy updated CODESYS project and confirm NVL sender/receiver symbol binding still resolves.
+2. Load updated `/root/.node-red/room-config.js` and redeploy flows.
+3. Import HA helpers from `lights_by_area_room_type_index.yaml`.
+4. Test one circuit per area end-to-end:
+   - HA toggle -> Node-RED -> NVL_In -> PLC output -> NVL_Out -> HA sync.