Improve 3D gallery and debug checkup workflow for image curation.

Add parquet floor, museum-style exit, movement-tinted walls, and gold/black
frames with gallery sync after Fix it. Debug panel gets Checked and Fix it
buttons; documentation and image-fetch reliability updates included.

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

client/src/types/index.ts

@@ -61,6 +61,8 @@ export interface Painting {
   sort_order: number;
   artist_name?: string;
   has_influence_links?: boolean | string | number;
+  checkup_checked?: boolean;
+  checkup_fixed?: boolean;
 }
 
 export type InfluenceSourceType = 'painting' | 'artist' | 'movement';
@@ -99,7 +101,7 @@ export interface PaintingDetail {
 }
 
 export interface ArtistDetail {
-  artist: Artist & { movement_name: string };
+  artist: Artist & { movement_name: string; movement_color?: string };
   periods: ArtistPeriod[];
   paintings: Painting[];
 }