Add Walnut Pi Box and 1B-DDR3 board images

[TallGuy74]

Board images for walnutpi-box and walnutpi-1b-ddr3, for armbian/build#10342 (stacked on the walnut-pi-h618-family branch; only the last commit is new). All pass scripts/validate-board-assets.sh.

[coderabbitai]

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[igorpecovnik]

But there are pictures without those lines available https://www.aliexpress.com/item/1005006129955506.html

[TallGuy74]

Good call — replaced with the official store product photos: clean cutouts, no annotation overlays, and they show the current board revision. Applied across both PRs (#378 has 1b + zerow from the same source). All pass validate-board-assets.sh.

[github-actions]

✅ This PR has been reviewed and approved — all set for merge!