feat(flashcards): révision SM-2, génération IA et page /revision

Livre US-FLASHCARDS avec decks, session de révision, stats et migration Prisma. Finalise le Web Clipper (i18n 15 langues) et corrige les erreurs ESLint bloquant la CI.

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

memento-note/app/api/flashcards/decks/[id]/route.ts

@@ -0,0 +1,37 @@
+import { NextRequest, NextResponse } from 'next/server'
+import { auth } from '@/auth'
+import { getDeckDetail } from '@/lib/flashcards/deck-queries'
+
+export async function GET(
+  _request: NextRequest,
+  { params }: { params: Promise<{ id: string }> },
+) {
+  try {
+    const session = await auth()
+    if (!session?.user?.id) {
+      return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
+    }
+
+    const { id } = await params
+    const deck = await getDeckDetail(session.user.id, id)
+    if (!deck) {
+      return NextResponse.json({ error: 'Deck not found' }, { status: 404 })
+    }
+
+    const now = new Date()
+    const dueCount = deck.cards.filter((c) => c.due).length
+    const masteredCount = deck.cards.filter((c) => c.mastered).length
+
+    return NextResponse.json({
+      deck,
+      stats: {
+        total: deck.cards.length,
+        due: dueCount,
+        mastered: masteredCount,
+      },
+    })
+  } catch (error) {
+    console.error('[flashcards/decks/[id] GET]', error)
+    return NextResponse.json({ error: 'Failed to load deck' }, { status: 500 })
+  }
+}