Add ESP32-C3 SPI slave with ESP-NOW, Raspberry Pi test tools, and updated project structure

- ESP32-C3 SPI slave project with ESP-NOW broadcast functionality
- Raspberry Pi SPI master test tools and CLI for JSON communication
- Merged src/ directory from full branch with lighting controller code
- Updated Pipfile with system install scripts and ESP32 monitoring
- Added comprehensive test suite for SPI communication

esp32/build/bootloader-prefix/src/bootloader-stamp/bootloader-source_dirinfo.txt

@@ -0,0 +1,9 @@
+# This is a generated file and its contents are an internal implementation detail.
+# The download step will be re-executed if anything in this file changes.
+# No other meaning or use of this file is supported.
+
+method=source_dir
+command=
+source_dir=/home/pi/esp/esp-idf/components/bootloader/subproject
+work_dir=
+

esp32/build/bootloader-prefix/tmp/bootloader-cfgcmd.txt

@@ -0,0 +1 @@
+cmd='/usr/bin/cmake;-DSDKCONFIG=/home/pi/lighting-controller/esp32/sdkconfig;-DIDF_PATH=/home/pi/esp/esp-idf;-DIDF_TARGET=esp32c3;-DPYTHON_DEPS_CHECKED=1;-DPYTHON=/home/pi/.espressif/python_env/idf6.0_py3.11_env/bin/python;-DEXTRA_COMPONENT_DIRS=/home/pi/esp/esp-idf/components/bootloader;-DPROJECT_SOURCE_DIR=/home/pi/lighting-controller/esp32;-DIGNORE_EXTRA_COMPONENT=;-GNinja;<SOURCE_DIR><SOURCE_SUBDIR>'

esp32/build/bootloader-prefix/tmp/bootloader-mkdirs.cmake

@@ -0,0 +1,22 @@
+# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+cmake_minimum_required(VERSION 3.5)
+
+file(MAKE_DIRECTORY
+  "/home/pi/esp/esp-idf/components/bootloader/subproject"
+  "/home/pi/lighting-controller/esp32/build/bootloader"
+  "/home/pi/lighting-controller/esp32/build/bootloader-prefix"
+  "/home/pi/lighting-controller/esp32/build/bootloader-prefix/tmp"
+  "/home/pi/lighting-controller/esp32/build/bootloader-prefix/src/bootloader-stamp"
+  "/home/pi/lighting-controller/esp32/build/bootloader-prefix/src"
+  "/home/pi/lighting-controller/esp32/build/bootloader-prefix/src/bootloader-stamp"
+)
+
+set(configSubDirs )
+foreach(subDir IN LISTS configSubDirs)
+    file(MAKE_DIRECTORY "/home/pi/lighting-controller/esp32/build/bootloader-prefix/src/bootloader-stamp/${subDir}")
+endforeach()
+if(cfgdir)
+  file(MAKE_DIRECTORY "/home/pi/lighting-controller/esp32/build/bootloader-prefix/src/bootloader-stamp${cfgdir}") # cfgdir has leading slash
+endif()