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>

client/src/components/PaintingAnnotations.tsx

@@ -1,13 +1,14 @@
 import { useRef } from 'react';
+import { useTranslation } from 'react-i18next';
 import type { PaintingAnnotation } from '../types';
 import './PaintingAnnotations.css';
 
-const CATEGORY_LABELS: Record<string, string> = {
-  technique: 'Technique',
-  composition: 'Composition',
-  symbolism: 'Symbolism',
-  history: 'History',
-  subject: 'Subject',
+const CATEGORY_KEYS: Record<string, string> = {
+  technique: 'categoryTechnique',
+  composition: 'categoryComposition',
+  symbolism: 'categorySymbolism',
+  history: 'categoryHistorical',
+  subject: 'categorySubject',
 };
 
 interface PanelProps {
@@ -57,6 +58,7 @@ export default function PaintingAnnotationsPanel({
   activeId,
   onSelect,
 }: PanelProps) {
+  const { t } = useTranslation('annotations');
   const cardRefs = useRef<Map<number, HTMLLIElement>>(new Map());
 
   if (!annotations.length) return null;
@@ -70,11 +72,12 @@ export default function PaintingAnnotationsPanel({
 
   return (
     <aside className="painting-annotations-panel" aria-label="Art history annotations">
-      <h3 className="painting-annotations-title">Art history notes</h3>
+      <h3 className="painting-annotations-title">{t('title')}</h3>
       <ul className="painting-annotations-list">
         {annotations.map((ann, index) => {
           const isActive = activeId === ann.id;
-          const category = CATEGORY_LABELS[ann.category] || ann.category;
+          const categoryKey = CATEGORY_KEYS[ann.category];
+          const category = categoryKey ? t(categoryKey) : ann.category;
           return (
             <li
               key={ann.id}
@@ -110,7 +113,7 @@ export default function PaintingAnnotationsPanel({
                   rel="noopener noreferrer"
                   onClick={(e) => e.stopPropagation()}
                 >
-                  Read source
+                  {t('readSource')}
                 </a>
               )}
             </li>