Fix missing zblue external include directories in CMake build

[Copilot]

CMakeLists.txt was missing external zblue include paths required by the Zephyr stack adapter, causing compilation failures when CONFIG_BLUETOOTH_STACK_BREDR_ZBLUE or CONFIG_BLUETOOTH_STACK_LE_ZBLUE is enabled.

Changes

• Added 4 external zblue include directories to match Makefile implementation (lines 278-281)
  • port/include/ - for <zephyr/device.h>, <zephyr/kernel.h>
  • subsys/bluetooth/host - for <zephyr/bluetooth/*.h>
  • subsys/settings/include/settings - for <zephyr/settings/settings.h>
  • port/include/kernel/include - for kernel headers

The zephyr stack adapter files (hci_h4.c, sal_adapter_le_interface.c, etc.) include these headers but the paths were only present in Makefile, not CMakeLists.txt.

if(CONFIG_BLUETOOTH_STACK_BREDR_ZBLUE OR CONFIG_BLUETOOTH_STACK_LE_ZBLUE)
  list(APPEND INCDIR ${BLUETOOTH_DIR}/service/stacks/zephyr/include)
  list(APPEND INCDIR ${NUTTX_APPS_DIR}/external/zblue/zblue/port/include/)
  list(APPEND INCDIR ${NUTTX_APPS_DIR}/external/zblue/zblue/subsys/bluetooth/host)
  list(APPEND INCDIR ${NUTTX_APPS_DIR}/external/zblue/zblue/subsys/settings/include/settings)
  list(APPEND INCDIR ${NUTTX_APPS_DIR}/external/zblue/zblue/port/include/kernel/include)

Follows existing pattern for external dependencies (dbus, glib, bluelet) using ${NUTTX_APPS_DIR}/external/.

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