feat(screenshots): CC0/PD example photos for all visible varieties (+CREDITS)

apps/app_seeds/test/screenshots/fixtures/CREDITS.md

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+# Example inventory photos — credits
+
+CC0 / public-domain images used as example variety photos in the screenshot
+harness only (to generate store/landing screenshots). They are **not** bundled
+in the app. Square-cropped and re-compressed from the originals below.
+
+| Fixture | Subject | Author | License | Source |
+|---|---|---|---|---|
+| maize.jpg | Red & white flint corn | vjrj (Tane project) | own photo | — |
+| buckwheat.jpg | Fagopyrum esculentum (buckwheat) | Daderot | CC0 | https://commons.wikimedia.org/wiki/File:Fagopyrum_esculentum_-_Osaka_Museum_of_Natural_History_-_DSC07737.JPG |
+| tomato.jpg | Ripe red tomatoes | Glenda Green | CC0 | https://commons.wikimedia.org/wiki/File:Ripe_Red_Tomatoes.jpg |
+| pepper.jpg | Capsicum annuum (Guajillo), dried | ZooFari | Public domain | https://commons.wikimedia.org/wiki/File:Capsicum_annuum_(Guajillo)_-_dried.jpg |
+| raspberry.jpg | Rubus idaeus (raspberry) | Vassil | Public domain | https://commons.wikimedia.org/wiki/File:Framboise_Margy_3.jpg |