feat(products): export hosted detail URL for fetched images; snapshot carries status (SD-0002 §6.5.5, INV-16)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

backend/app/domains/products/repo.py

@@ -91,7 +91,7 @@ def load_catalog(conn: psycopg.Connection, storefront_id: int) -> dict[str, Cata
             )
         )
     for row in conn.execute(
-        "SELECT i.product_id, i.id, i.source_url, i.position, i.alt_text"
+        "SELECT i.product_id, i.id, i.source_url, i.position, i.alt_text, i.status"
         " FROM product_image i"
         " JOIN product p ON p.id = i.product_id"
         " WHERE p.storefront_id = %s"
@@ -99,7 +99,8 @@ def load_catalog(conn: psycopg.Connection, storefront_id: int) -> dict[str, Cata
         (storefront_id,),
     ):
         by_id[row[0]].images.append(
-            CatalogImage(id=row[1], source_url=row[2], position=row[3], alt_text=row[4])
+            CatalogImage(id=row[1], source_url=row[2], position=row[3],
+                         alt_text=row[4], status=row[5])
         )
     return catalog