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/gdbinit/connect

@@ -0,0 +1,7 @@
+# Connect to the default openocd-esp port and stop on app_main()
+set remotetimeout 10
+target remote :3333
+monitor reset halt
+maintenance flush register-cache
+thbreak app_main
+continue

esp32/build/gdbinit/gdbinit

@@ -0,0 +1,2 @@
+source /home/pi/lighting-controller/esp32/build/gdbinit/symbols
+source /home/pi/lighting-controller/esp32/build/gdbinit/connect

esp32/build/gdbinit/prefix_map

@@ -0,0 +1 @@
+# There is no prefix map defined for the project.

esp32/build/gdbinit/py_extensions

@@ -0,0 +1,7 @@
+# Add Python GDB extensions
+python
+try:
+    import freertos_gdb
+except ModuleNotFoundError:
+    print('warning: python extension "freertos_gdb" not found.')
+end

esp32/build/gdbinit/symbols

@@ -0,0 +1,30 @@
+# Load esp32c3 ROM ELF symbols
+define target hookpost-remote
+set confirm off
+  # if $_streq((char *) 0x3ff1b878, "Sep 18 2020")
+  if (*(int*) 0x3ff1b878) == 0x20706553 && (*(int*) 0x3ff1b87c) == 0x32203831 && (*(int*) 0x3ff1b880) == 0x303230
+    add-symbol-file /home/pi/.espressif/tools/esp-rom-elfs/20241011/esp32c3_rev0_rom.elf
+  else
+    # if $_streq((char *) 0x3ff1a374, "Feb  7 2021")
+    if (*(int*) 0x3ff1a374) == 0x20626546 && (*(int*) 0x3ff1a378) == 0x32203720 && (*(int*) 0x3ff1a37c) == 0x313230
+      add-symbol-file /home/pi/.espressif/tools/esp-rom-elfs/20241011/esp32c3_rev3_rom.elf
+    else
+      # if $_streq((char *) 0x3ff1a3dc, "Mar  1 2023")
+      if (*(int*) 0x3ff1a3dc) == 0x2072614d && (*(int*) 0x3ff1a3e0) == 0x32203120 && (*(int*) 0x3ff1a3e4) == 0x333230
+        add-symbol-file /home/pi/.espressif/tools/esp-rom-elfs/20241011/esp32c3_rev101_rom.elf
+      else
+        echo Warning: Unknown esp32c3 ROM revision.\n
+      end
+    end
+  end
+set confirm on
+end
+
+
+# Load bootloader symbols
+set confirm off
+    add-symbol-file /home/pi/lighting-controller/esp32/build/bootloader/bootloader.elf
+set confirm on
+
+# Load application symbols
+file /home/pi/lighting-controller/esp32/build/spi_slave.elf