Add multi-panel Pico UDP firmware and Python LED control.

Pico panels get static IPs on 10.1.1.10–14 with per-panel LED counts, Makefile deploy targets, and Python examples for animations, sync tests, and direct Pi SPI control.

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

firmware/panel/CMakeLists.txt

@@ -0,0 +1,74 @@
+cmake_minimum_required(VERSION 3.13)
+
+set(PICO_BOARD pico CACHE STRING "Board type")
+
+include(pico_sdk_import.cmake)
+
+project(portal_panel C CXX ASM)
+set(CMAKE_C_STANDARD 11)
+
+pico_sdk_init()
+
+include(FetchContent)
+FetchContent_Declare(
+    iolibrary
+    GIT_REPOSITORY https://github.com/Wiznet/ioLibrary_Driver.git
+    GIT_TAG master
+)
+FetchContent_MakeAvailable(iolibrary)
+
+set(IOLIB_DIR ${iolibrary_SOURCE_DIR})
+
+add_executable(panel
+    main.c
+    wizchip_spi.c
+    timer.c
+    ws2812_led.cpp
+    WS2812.cpp
+    ${IOLIB_DIR}/Ethernet/socket.c
+    ${IOLIB_DIR}/Ethernet/wizchip_conf.c
+    ${IOLIB_DIR}/Ethernet/W5500/w5500.c
+    ${IOLIB_DIR}/Internet/DHCP/dhcp.c
+)
+
+pico_generate_pio_header(panel ${CMAKE_CURRENT_LIST_DIR}/WS2812.pio)
+
+target_include_directories(panel PRIVATE
+    ${CMAKE_CURRENT_LIST_DIR}
+    ${IOLIB_DIR}/Ethernet
+    ${IOLIB_DIR}/Internet/DHCP
+)
+
+target_compile_definitions(panel PRIVATE
+    _WIZCHIP_=W5500
+)
+
+if (DEFINED PANEL_ID_BUILD)
+    target_compile_definitions(panel PRIVATE PANEL_ID=${PANEL_ID_BUILD})
+endif ()
+
+if (DEFINED NUM_LEDS_BUILD)
+    target_compile_definitions(panel PRIVATE NUM_LEDS=${NUM_LEDS_BUILD})
+endif ()
+
+if (DEFINED WS2812_PIN_BUILD)
+    target_compile_definitions(panel PRIVATE PIN_WS2812=${WS2812_PIN_BUILD})
+endif ()
+
+option(PORTAL_USE_DHCP "Use DHCP for W5500" OFF)
+if (PORTAL_USE_DHCP)
+    target_compile_definitions(panel PRIVATE USE_DHCP=1)
+else ()
+    target_compile_definitions(panel PRIVATE USE_DHCP=0)
+endif ()
+
+target_link_libraries(panel
+    pico_stdlib
+    hardware_spi
+    hardware_pio
+)
+
+pico_enable_stdio_usb(panel 1)
+pico_enable_stdio_uart(panel 0)
+
+pico_add_extra_outputs(panel)