Refine PLC algorithm documentation for lighting control and EtherCAT integration

- Updated the output structure for `struct_room_outs` to focus solely on light states, removing unnecessary status feedback fields.
- Simplified the control logic for lights 1 to 6, aligning with the new design approach for Option C.
- Added detailed instructions for declaring `EtherCAT_RelayFeedback` and `EtherCAT_Outputs` in the Global Variable List, enhancing clarity for integration with the EL2809 module.

This update improves the documentation's accuracy and usability for developers working on the home automation system.

codesys/src/DUT/struct_room_cmds.typ

@@ -0,0 +1,32 @@
+(*
+  DUT: struct_room_cmds
+  Room lighting commands from Node-RED/Home Assistant (flat for JSON).
+  Used as input to fb_room.
+*)
+TYPE struct_room_cmds :
+STRUCT
+    // Home Assistant Commands (set/reset)
+    ha_l1_on: BOOL;
+    ha_l1_off: BOOL;
+    ha_l2_on: BOOL;
+    ha_l2_off: BOOL;
+    ha_l3_on: BOOL;
+    ha_l3_off: BOOL;
+    ha_l4_on: BOOL;
+    ha_l4_off: BOOL;
+    ha_l5_on: BOOL;
+    ha_l5_off: BOOL;
+    ha_l6_on: BOOL;
+    ha_l6_off: BOOL;
+    // Zigbee Switch Inputs (edge detection for toggle)
+    zigbee_sw1: BOOL;
+    zigbee_sw2: BOOL;
+    zigbee_sw3: BOOL;
+    zigbee_sw4: BOOL;
+    zigbee_sw5: BOOL;
+    zigbee_sw6: BOOL;
+    // Global Commands
+    ha_all_on: BOOL;
+    ha_all_off: BOOL;
+END_STRUCT
+END_TYPE