Align docs with ESP32-S3 dashboard architecture

hardware/bom.md

@@ -2,15 +2,13 @@
 
 ## Ordered
 
-- Raspberry Pi Pico 2 W
 - ESP32 2-Channel Relay Board
-- 3.5" SPI Capacitive Touchscreen
 
 ## Required
 
 - 4x DS18B20 Waterproof Sensors
-- 12V→5V Buck Converter
-- CAT5 Cable
+- Waveshare ESP32-S3-Touch-LCD-5 dashboard
+- Fused ACC switched 12V dashboard power
 - Bosch Relay Sockets
 - 30A/40A Bosch Relays
 - Automotive Fuse Block
@@ -18,8 +16,7 @@
 
 ## Future / Optional Fallback
 
-- 2x MAX3485 RS-485 Modules, only if UART over CAT5 proves unreliable
-- Pi Zero 2 W
+- Pi Zero for long-term logging and local integrations
 - GPS Module
 - ELM327 OBD-II Interface
 - CAN Interface