docs: switch to ESP32-S3 and add logging server

- Update HARDWARE.md to recommend ESP32-S3 over RP2040 to support Wi-Fi
  logging capabilities and better GPIO availability.
- Initialize a Node.js Express server to receive and store test results
  from the hardware device.
- Add a web-based dashboard to visualize HDMI pin status history, including
  basic pass/fail logic for voltage drops.

HARDWARE.md

@@ -9,10 +9,10 @@ This project aims to create a handheld HDMI tester for console repair technician
 
 To measure diode mode (voltage drop across a diode junction), we need a microcontroller with an ADC and the ability to source a small constant current or use a pull-up resistor.
 
-### 1. Microcontroller: ESP32 or Raspberry Pi Pico
-- **ESP32**: Integrated Wi-Fi/BT (good for future logging), multiple ADCs.
-- **RP2040 (Pico)**: Great documentation, dual-core, very affordable, stable ADCs.
-- **Recommendation**: **Raspberry Pi Pico** for its simplicity and 3.3V logic which is safer for HDMI lines.
+### 1. Microcontroller: ESP32 (S3 or DevKitV1)
+- **ESP32**: Integrated Wi-Fi/BT is essential for the server-side logging feature. It has multiple ADCs and enough GPIOs to drive the multiplexers.
+- **RP2040 (Pico W)**: Also an option, but ESP32 has better community support for async HTTP clients.
+- **Recommendation**: **ESP32-S3** for its high number of GPIOs and built-in Wi-Fi.
 
 ### 2. Multiplexers (Mux)
 Since the Pico doesn't have 19 ADC pins, we need multiplexers to switch between the HDMI pins.
@@ -39,5 +39,5 @@ Since the Pico doesn't have 19 ADC pins, we need multiplexers to switch between
 
 ## Next Steps
 1. Define the Pinout mapping.
-2. Create the software structure (C++ or MicroPython).
+2. Create the software structure (C++ / Arduino with ESP32 WiFi libraries).
 3. Implement the measurement logic.