Add portal web simulator, SPI bridges, and Pico firmware updates.

Bring the five-panel hex portal online with a browser 3D/schematic preview, Pi SPI backends, and renamed multi-panel Pico UDP firmware.

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

firmware/pico/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