Upload to the SD card the device has, not to /mnt/dmsdio0_0p1

[JaxCalder]

Summary

upload-files / install-all sent the files to /mnt/dmsdio0_0p1, which is where automount mounts a card without a label. A card with a label is mounted at /mnt/<label>, for example /mnt/bootfs on another board, so the files never reached it.

Now scripts/ymodem_send.py finds the card:

• A relative or empty --dest is on the SD card. The script types ls /mnt into the console and uses the one card mounted there. It then types ymodem recv -d /mnt/<card>/<dest>.
• --card NAME picks one of several cards. --card none keeps the old meaning: under the shell's current directory.
• With --wait (as install-all uses it after the flash), it asks again until automount has mounted the card.
• With several cards, or none, it stops and lists what it found.
• An absolute --dest is used as before.

In CMake, DMBOOT_UPLOAD_DEST is now empty by default (the card's root), and the new DMBOOT_UPLOAD_CARD (default auto) names the card. The README documents both.

Also: upload-files and install-all now depend on download_sdcard_modules. build/sdcard was made only by all, so after building just the firmware (--target install-firmware / dmboot.elf) there was nothing to send, and install-all failed after it had already flashed the board.

Also: when the device reports files it did not write (they were in use, e.g. the MP3 being played; see choco-technologies/dmell#63), the script lists them, suggests stopping what uses them, and exits with an error:

ymodem_send: some files were not written - in use on the device? Stop what uses them (e.g. `service stop carhmi`) and send them again: Alexander.mp3

Note on existing build directories: they keep the cached DMBOOT_UPLOAD_DEST=/mnt/dmsdio0_0p1. Reconfigure with -DDMBOOT_UPLOAD_DEST= to get the detection.

Test plan

• STM32F746G-DISCO (card at /mnt/dmsdio0_0p1): --dest yt goes to /mnt/dmsdio0_0p1/yt. --card bootfs stops with no card bootfs in /mnt (found: dmsdio0_0p1). An absolute --dest works as before.
• Reset, then --wait 90: the script waits for the card (about 15 s) and sends the file
• A fresh configure: upload-files and install-all depend on download_sdcard_modules, which makes build/sdcard (carhmi_view)
• The MP3 being played plus a small file (with dmell#63): the small file is written, the MP3 is listed, exit 1
• Parsing the ls output: an echo running into the output, the coloured prompt, a missing /mnt, several cards, boot noise and the CANs of a failed transfer left on the shell's line (only what follows the echo counts, and only printable names)
• Reset, then the whole build/sdcard (46 files) with --wait 90: through, twice. With libdmview_open: read the view whole, close it, then make the view dmview#20 the board's view no longer blocks carhmi.dmv.

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