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>

examples/panel_udp_send.py

@@ -11,6 +11,7 @@ from leds.panel_udp import (
     add_panel_args,
     format_panel_targets,
     panel_targets_from_args,
+    parse_pins_arg,
     run_panel_animation_loop,
 )
 
@@ -35,6 +36,8 @@ def main() -> int:
             fps=args.fps,
             brightness=args.brightness,
             panel_id=args.panel_id,
+            pin=args.pin,
+            pins=parse_pins_arg(args),
         )
     except KeyboardInterrupt:
         print("\nStopped.")