Fix debug upload persistence and UX; exclude prod audit log from DB restore

Uploads and fixes now bust browser cache via file-mtime keys in API
responses. Debug upload shows a centered loading overlay and blocks search
while uploading. Prod DB restore skips curator_audit_log.

Co-authored-by: Cursor <cursoragent@cursor.com>

client/src/pages/HomePage.tsx

@@ -232,6 +232,8 @@ export default function HomePage() {
     const patch: Partial<Painting> = {
       image_path: fixResult.imagePath,
       thumbnail_path: fixResult.thumbnailPath,
+      image_cache_key: fixResult.image_cache_key ?? null,
+      thumbnail_cache_key: fixResult.thumbnail_cache_key ?? null,
       checkup_checked: fixResult.checked ?? true,
       checkup_fixed: fixResult.fixed ?? true,
     };
@@ -359,6 +361,9 @@ export default function HomePage() {
       const data = await api.getArtist(artistId);
       const patch: Partial<Artist> = {
         portrait_path: fixResult.portraitPath,
+        portrait_thumb_path: fixResult.portraitThumbPath ?? null,
+        portrait_cache_key: fixResult.portrait_cache_key ?? null,
+        portrait_thumb_cache_key: fixResult.portrait_thumb_cache_key ?? null,
         checkup_checked: fixResult.checked ?? true,
         checkup_fixed: fixResult.fixed ?? true,
       };