Replace MicroPython runtime with Pico C + W5500 firmware.

Ship UDP RGB panel firmware (eight WS2812 strips) and drop the ESP32 Wi-Fi/MicroPython stack.

Co-authored-by: Cursor <cursoragent@cursor.com>

firmware/timer.h

@@ -0,0 +1,10 @@
+#ifndef PANEL_TIMER_H
+#define PANEL_TIMER_H
+
+#include "pico/stdlib.h"
+
+void wizchip_1ms_timer_initialize(void (*callback)(void));
+bool wizchip_1ms_timer_callback(struct repeating_timer *t);
+void wizchip_delay_ms(uint32_t ms);
+
+#endif