feat: complete inventory image and sales workflows

Commit the working vertical slices for inventory image processing and the Sale workflow, including Sale history, audited voiding, multi-item persistence, admin UI, migrations, documentation, and tests.

apps/web/src/pages/AdminImagePage.vue

@@ -7,7 +7,7 @@ import { useAdminImages } from '@/composables/useAdminImages.js';
 
 const route = useRoute();
 const inventoryItemId = route.params.id;
-const { images, isLoading, isSaving, error, load, reorder, setPrimary, updateAltText, retry, remove } = useAdminImages(inventoryItemId);
+const { images, isLoading, isSaving, error, load, upload, reorder, setPrimary, updateAltText, retry, remove } = useAdminImages(inventoryItemId);
 
 onMounted(load);
 </script>
@@ -23,6 +23,7 @@ onMounted(load);
       v-else
       :images="images"
       :processing-status="isSaving ? 'PROCESSING' : (images[0]?.processingStatus ?? 'COMPLETED')"
+      @upload="upload"
       @reorder="reorder($event.id, $event.sortOrder)"
       @primary="setPrimary"
       @alt-text="updateAltText(images[0]?.id, $event)"