Add Russian i18n with DB translations, locale API, and curator review UI.

UI chrome via react-i18next, catalog text in entity_translations with ru.wikipedia seeding, locale-aware search, and Translations page for publish workflow.

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

scripts/harmonize-db.js

@@ -29,6 +29,7 @@ const CATALOG_TABLES = [
   'painting_influences',
   'painting_influence_sources',
   'painting_annotations',
+  'entity_translations',
 ];
 
 const NATURAL_KEY_FN = {
@@ -40,6 +41,7 @@ const NATURAL_KEY_FN = {
   painting_influences: (r) => `${r.painting_id}:${r.influenced_by_painting_id}`,
   painting_influence_sources: (r) => `${r.painting_id}:${r.source_type}:${r.source_painting_id || 0}:${r.source_artist_id || 0}:${r.source_movement_id || 0}`,
   painting_annotations: (r) => `${r.painting_id}:${String(r.label || '').trim().toLowerCase()}:${r.sort_order}`,
+  entity_translations: (r) => `${r.entity_type}:${r.entity_id}:${r.locale}:${r.field_name}`,
 };
 
 function parseArgs(argv) {