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/CMakeFiles/clean_additional.cmake

@@ -0,0 +1,24 @@
+# Additional clean files
+cmake_minimum_required(VERSION 3.16)
+
+if("${CONFIG}" STREQUAL "" OR "${CONFIG}" STREQUAL "")
+  file(REMOVE_RECURSE
+  "bootloader/bootloader.bin"
+  "bootloader/bootloader.elf"
+  "bootloader/bootloader.map"
+  "config/sdkconfig.cmake"
+  "config/sdkconfig.h"
+  "esp-idf/mbedtls/x509_crt_bundle"
+  "flash_app_args"
+  "flash_bootloader_args"
+  "flash_project_args"
+  "flasher_args.json"
+  "flasher_args.json.in"
+  "ldgen_libraries"
+  "ldgen_libraries.in"
+  "project_elf_src_esp32c3.c"
+  "spi_slave.bin"
+  "spi_slave.map"
+  "x509_crt_bundle.S"
+  )
+endif()