feat: working basic firmware with legacy USB API

- Successful compilation with Zephyr 4.3.0
- Basic gs_usb USB interface implementation
- CAN-FD support with FDCAN2 interface
- PFET control via UART (simplified from USB CDC)
- Custom board definition for STM32G0B1KBU6
- Deprecated warnings present but functional
- Memory usage: 51KB Flash (9.8%), 21.6KB RAM (14.7%)

Next: Migrate to new USB device stack API to remove warnings

firmware/canfd_cdc_composite/build/modules/hal_rpi_pico/cmake_install.cmake

@@ -0,0 +1,45 @@
+# Install script for directory: C:/Users/iteedi/zephyrproject/zephyr/modules/hal_rpi_pico
+
+# Set the install prefix
+if(NOT DEFINED CMAKE_INSTALL_PREFIX)
+  set(CMAKE_INSTALL_PREFIX "C:/Program Files (x86)/Zephyr-Kernel")
+endif()
+string(REGEX REPLACE "/$" "" CMAKE_INSTALL_PREFIX "${CMAKE_INSTALL_PREFIX}")
+
+# Set the install configuration name.
+if(NOT DEFINED CMAKE_INSTALL_CONFIG_NAME)
+  if(BUILD_TYPE)
+    string(REGEX REPLACE "^[^A-Za-z0-9_]+" ""
+           CMAKE_INSTALL_CONFIG_NAME "${BUILD_TYPE}")
+  else()
+    set(CMAKE_INSTALL_CONFIG_NAME "")
+  endif()
+  message(STATUS "Install configuration: \"${CMAKE_INSTALL_CONFIG_NAME}\"")
+endif()
+
+# Set the component getting installed.
+if(NOT CMAKE_INSTALL_COMPONENT)
+  if(COMPONENT)
+    message(STATUS "Install component: \"${COMPONENT}\"")
+    set(CMAKE_INSTALL_COMPONENT "${COMPONENT}")
+  else()
+    set(CMAKE_INSTALL_COMPONENT)
+  endif()
+endif()
+
+# Is this installation the result of a crosscompile?
+if(NOT DEFINED CMAKE_CROSSCOMPILING)
+  set(CMAKE_CROSSCOMPILING "TRUE")
+endif()
+
+# Set path to fallback-tool for dependency-resolution.
+if(NOT DEFINED CMAKE_OBJDUMP)
+  set(CMAKE_OBJDUMP "C:/Users/iteedi/zephyr-sdk-0.17.4/arm-zephyr-eabi/bin/arm-zephyr-eabi-objdump.exe")
+endif()
+
+string(REPLACE ";" "\n" CMAKE_INSTALL_MANIFEST_CONTENT
+       "${CMAKE_INSTALL_MANIFEST_FILES}")
+if(CMAKE_INSTALL_LOCAL_ONLY)
+  file(WRITE "C:/Users/iteedi/zephyrproject/projects/EWS/firmware/canfd_cdc_composite/build/modules/hal_rpi_pico/install_local_manifest.txt"
+     "${CMAKE_INSTALL_MANIFEST_CONTENT}")
+endif()