feat: publication IA (magazine/brief/essay) + fixes critique

Publication IA:
- 4 templates (magazine, brief, essay, simple) avec CSS riche
- Rewrite IA (article/exercises/tutorial/reference/mixed)
- Modération avec timeout 12s + fallback safe
- Quotas publish_enhance par tier (basic=2, pro=15, business=100)
- Détection contenu stale (hash)
- Migration DB publishedContent/publishedTemplate/publishedSourceHash

Fixes:
- cheerio v1.2: Element -> AnyNode (domhandler), decodeEntities cast
- _isShared ajouté au type Note (champ virtuel serveur)
- callout colors PDF export: extraction fonction pure testable
- admin/published: guard note.userId null
- Cmd+S fonctionne en mode dialog (pas seulement fullPage)

i18n:
- 23 clés publish* traduites dans les 15 locales
- Extension Web Clipper: 13 locales mise à jour

Tests:
- callout-colors.test.ts (6 tests)
- note-visible-in-view.test.ts (5 tests)
- entitlements.test.ts + byok-entitlements.test.ts: mock usageLog + unstubAllEnvs
- 199/199 tests passent

Tracker: user-stories.md sync avec sprint-status.yaml

memento-note/app/api/ai/generate-exercises/route.ts

@@ -4,6 +4,7 @@ import prisma from '@/lib/prisma'
 import { exerciseGeneratorService } from '@/lib/ai/services/exercise-generator.service'
 import { reserveUsageOrThrow, QuotaExceededError } from '@/lib/entitlements'
 import { preprocessMathInHtml } from '@/lib/text/math-preprocess'
+import { hasUserAiConsent, aiConsentForbiddenResponse } from '@/lib/consent/server-consent'
 
 export async function POST(request: NextRequest) {
   try {
@@ -17,6 +18,8 @@ export async function POST(request: NextRequest) {
       return NextResponse.json({ error: 'noteId is required' }, { status: 400 })
     }
 
+    if (!(await hasUserAiConsent())) return aiConsentForbiddenResponse()
+
     try {
       await reserveUsageOrThrow(session.user.id, 'reformulate')
     } catch (err) {
@@ -47,19 +50,27 @@ export async function POST(request: NextRequest) {
 
     // Create exercise notes in the same notebook
     const lang = language || 'fr'
-    const exerciseLabel = lang === 'fr' ? 'Exercice' : lang === 'fa' ? 'تمرین' : 'Exercise'
-    const answerLabel = lang === 'fr' ? 'Corrigé' : lang === 'fa' ? 'پاسخ' : 'Answer'
+    const exerciseLabel = lang === 'fr' ? 'Exercice' : lang === 'fa' ? 'تمرین' : lang === 'ar' ? 'تمرين' : lang === 'de' ? 'Übung' : lang === 'es' ? 'Ejercicio' : lang === 'it' ? 'Esercizio' : lang === 'pt' ? 'Exercício' : lang === 'ru' ? 'Упражнение' : lang === 'zh' ? '练习' : lang === 'ja' ? '練習' : lang === 'ko' ? '연습' : lang === 'nl' ? 'Oefening' : lang === 'pl' ? 'Ćwiczenie' : lang === 'hi' ? 'अभ्यास' : 'Exercise'
+    const answerLabel = lang === 'fr' ? 'Corrigé' : lang === 'fa' ? 'پاسخ' : lang === 'ar' ? 'الحل' : lang === 'de' ? 'Lösung' : lang === 'es' ? 'Solución' : lang === 'it' ? 'Soluzione' : lang === 'pt' ? 'Solução' : lang === 'ru' ? 'Решение' : lang === 'zh' ? '解答' : lang === 'ja' ? '解答' : lang === 'ko' ? '해답' : lang === 'nl' ? 'Oplossing' : lang === 'pl' ? 'Rozwiązanie' : lang === 'hi' ? 'हल' : 'Solution'
+    const statementLabel = lang === 'fr' ? 'Énoncé' : lang === 'fa' ? 'صورت مسئله' : lang === 'ar' ? 'السؤال' : lang === 'de' ? 'Aufgabe' : lang === 'es' ? 'Enunciado' : lang === 'it' ? 'Testo' : lang === 'pt' ? 'Enunciado' : lang === 'ru' ? 'Задание' : lang === 'zh' ? '题目' : lang === 'ja' ? '問題' : lang === 'ko' ? '문제' : lang === 'nl' ? 'Opgave' : lang === 'pl' ? 'Zadanie' : lang === 'hi' ? 'प्रश्न' : 'Statement'
+    const revealLabel = lang === 'fr' ? 'cliquer pour révéler' : lang === 'fa' ? 'برای نمایش کلیک کنید' : lang === 'ar' ? 'انقر للكشف' : lang === 'de' ? 'zum Anzeigen klicken' : lang === 'es' ? 'haz clic para ver' : lang === 'it' ? 'clicca per rivelare' : lang === 'pt' ? 'clique para revelar' : lang === 'ru' ? 'нажмите, чтобы открыть' : lang === 'zh' ? '点击查看' : lang === 'ja' ? 'クリックして表示' : lang === 'ko' ? '클릭하여 보기' : lang === 'nl' ? 'klik om te onthullen' : lang === 'pl' ? 'kliknij, aby zobaczyć' : lang === 'hi' ? 'देखने के लिए क्लिक करें' : 'click to reveal'
+    const difficultyMap: Record<string, Record<string, string>> = {
+      facile: { fr: 'facile', en: 'easy', fa: 'آسان', ar: 'سهل', de: 'einfach', es: 'fácil', it: 'facile', pt: 'fácil', ru: 'лёгкий', zh: '简单', ja: '易しい', ko: '쉬움', nl: 'makkelijk', pl: 'łatwy', hi: 'आसान' },
+      moyen: { fr: 'moyen', en: 'medium', fa: 'متوسط', ar: 'متوسط', de: 'mittel', es: 'medio', it: 'medio', pt: 'médio', ru: 'средний', zh: '中等', ja: '普通', ko: '보통', nl: 'gemiddeld', pl: 'średni', hi: 'मध्यम' },
+      difficile: { fr: 'difficile', en: 'hard', fa: 'دشوار', ar: 'صعب', de: 'schwer', es: 'difícil', it: 'difficile', pt: 'difícil', ru: 'сложный', zh: '困难', ja: '難しい', ko: '어려움', nl: 'moeilijk', pl: 'trudny', hi: 'कठिन' },
+    }
 
     const createdNotes = []
     for (let i = 0; i < exercises.length; i++) {
       const ex = exercises[i]
       const difficultyEmoji = ex.difficulty === 'facile' ? '🟢' : ex.difficulty === 'moyen' ? '🟡' : '🔴'
+      const difficultyLocalized = (difficultyMap[ex.difficulty]?.[lang]) || ex.difficulty
 
       const rawContent = `
-<div data-type="callout-block" data-callout-type="warning"><p><strong>${exerciseLabel} ${i + 1}</strong> — ${difficultyEmoji} ${ex.difficulty}</p></div>
-<h2>Énoncé</h2>
+<div data-type="callout-block" data-callout-type="warning"><p><strong>${exerciseLabel} ${i + 1}</strong> — ${difficultyEmoji} ${difficultyLocalized}</p></div>
+<h2>${statementLabel}</h2>
 <p>${ex.question}</p>
-<div data-type="toggle-block" data-opened="false"><p><strong>${answerLabel}</strong> — cliquer pour révéler</p><h3>Solution</h3><p>${ex.answer}</p></div>
+<div data-type="toggle-block" data-opened="false"><p><strong>${answerLabel}</strong> — ${revealLabel}</p><h3>${answerLabel}</h3><p>${ex.answer}</p></div>
 `.trim()
 
       const content = preprocessMathInHtml(rawContent)