manifest: add label_pretty and firmware_category fields

Add human-readable labels and firmware classification to the build
manifest so ground stations like QGC can display friendly names and
filter builds by category.

New fields:
- label_pretty: human-readable variant name (e.g. "Multicopter")
- firmware_category: auto-detected classification
  - "vehicle" for multicopter, fixedwing, vtol, rover, uuv, spacecraft
  - "peripheral" for CAN sensor nodes (GPS, flow, mag, etc.)
  - "bootloader" for bootloader/canbootloader
  - "dev" for everything else (default, zenoh, mavlink-dev, etc.)

Peripheral detection uses ROMFSROOT="cannode" which is shared by all
~18 CAN sensor boards across ARK, Holybro, CUAV, Freefly, Matek, NXP.

A build-time warning fires when an unrecognized label falls through to
"dev", so new vehicle types are not silently hidden from end users.

Boards can override via CONFIG_BOARD_FIRMWARE_CATEGORY in .px4board.
CONFIG_BOARD_LABEL_PRETTY set on all px4/fmu-v6x variants as Phase 1.

Signed-off-by: Ramon Roche <mrpollo@gmail.com>

platforms/nuttx/CMakeLists.txt

@@ -439,6 +439,8 @@ if (TARGET parameters_xml AND TARGET airframes_xml)
 				--chip		"${CONFIG_ARCH_CHIP}"
 				--vid		"${CONFIG_CDCACM_VENDORID}"
 				--pid		"${CONFIG_CDCACM_PRODUCTID}"
+				--label-pretty	"${CONFIG_BOARD_LABEL_PRETTY}"
+				--firmware-category	"${CONFIG_BOARD_FIRMWARE_CATEGORY}"
 				--out		${MANIFEST_JSON}
 		DEPENDS
 			${PX4_SOURCE_DIR}/Tools/manifest/gen_board_manifest_from_defconfig.py