fix: deduplicate model photos in public resolver to match admin behavior

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/backend/src/graphql/resolvers/models.ts

@@ -12,10 +12,12 @@ async function enrichModel(db: any, user: any) {
     .where(eq(user_photos.user_id, user.id))
     .orderBy(user_photos.sort);
 
-  return {
+  const seen = new Set<string>();
-    ...user,
+  const photos = photoRows
-    photos: photoRows.map((p: any) => ({ id: p.id, filename: p.filename })),
+    .filter((p: any) => p.id && !seen.has(p.id) && seen.add(p.id))
-  };
+    .map((p: any) => ({ id: p.id, filename: p.filename }));
+
+  return { ...user, photos };
 }
 
 builder.queryField("models", (t) =>