Add checkup review flags, duplicate detection, and corrected painting images.

Introduce checkup_checked/checkup_fixed on paintings with Checkup page filters and API. Fixed paintings auto-mark as reviewed. Add find-duplicates tooling and document debug/checkup workflow. Include Botticelli and Michelangelo image fixes from checkup.

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

client/src/api/client.ts

@@ -67,6 +67,8 @@ export interface PaintingCheckupRow {
   detail_on_demand: boolean;
   gallery_file_exists: boolean;
   detail_file_exists: boolean | null;
+  checked: boolean;
+  fixed: boolean;
 }
 
 export interface PaintingCheckupData {
@@ -108,10 +110,26 @@ export const api = {
         const body = await res.json().catch(() => ({}));
         throw new Error(body.error || `Fix failed: ${res.status}`);
       }
-      return res.json() as Promise<{ imagePath: string; thumbnailPath: string }>;
+      return res.json() as Promise<{ imagePath: string; thumbnailPath: string; fixed?: boolean; checked?: boolean }>;
     }),
 
   getPaintingCheckup: () => fetchJson<PaintingCheckupData>(`${API}/paintings/checkup`),
+
+  updatePaintingCheckupFlags: (
+    id: number,
+    flags: { checked?: boolean; fixed?: boolean }
+  ) =>
+    fetch(`${API}/paintings/${id}/checkup-flags`, {
+      method: 'PATCH',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify(flags),
+    }).then(async (res) => {
+      if (!res.ok) {
+        const body = await res.json().catch(() => ({}));
+        throw new Error(body.error || `Update failed: ${res.status}`);
+      }
+      return res.json() as Promise<{ checked: boolean; fixed: boolean }>;
+    }),
 };
 
 export function debugImageProxyUrl(imageUrl: string): string {