feat(notes): vues structurées tableau/kanban, flashcards et MCP robuste

Ajoute la base organisable par carnet (schéma, champs partagés, valeurs par note)
avec activation guidée, tableau éditable, kanban et suppression de colonnes.
Corrige le multiselect en vue tableau et enrichit sidebar, grille et i18n FR/EN.
Inclut aussi les améliorations flashcards SM-2, l'audit consentement IA et la
robustesse du serveur MCP (config, validation, rate-limit, métriques).

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

memento-note/prisma/schema.prisma

@@ -113,6 +113,7 @@ model Notebook {
   user          User           @relation(fields: [userId], references: [id], onDelete: Cascade)
   workflows     Workflow[]
   flashcardDeck FlashcardDeck?
+  schema        NotebookSchema?
 
   @@index([userId, order])
   @@index([userId])
@@ -198,6 +199,7 @@ model Note {
   sourceLiveBlocks           LiveBlockRef[]           @relation("SourceLiveBlocks")
   targetLiveBlocks           LiveBlockRef[]           @relation("TargetLiveBlocks")
   flashcards                 Flashcard[]
+  properties                 NoteProperty[]
 
   @@index([isPinned])
   @@index([isArchived])
@@ -859,6 +861,42 @@ model BridgeSuggestion {
   @@index([clusterAId, clusterBId])
 }
 
+model NotebookSchema {
+  id           String             @id @default(cuid())
+  notebookId   String             @unique
+  viewSettings String?
+  createdAt    DateTime           @default(now())
+  updatedAt    DateTime           @updatedAt
+  notebook     Notebook           @relation(fields: [notebookId], references: [id], onDelete: Cascade)
+  properties   NotebookProperty[]
+}
+
+model NotebookProperty {
+  id         String           @id @default(cuid())
+  schemaId   String
+  name       String
+  type       String
+  options    String?
+  position   Int
+  schema     NotebookSchema   @relation(fields: [schemaId], references: [id], onDelete: Cascade)
+  noteValues NoteProperty[]
+
+  @@index([schemaId, position])
+}
+
+model NoteProperty {
+  id         String           @id @default(cuid())
+  noteId     String
+  propertyId String
+  value      String?
+  note       Note             @relation(fields: [noteId], references: [id], onDelete: Cascade)
+  property   NotebookProperty @relation(fields: [propertyId], references: [id], onDelete: Cascade)
+
+  @@unique([noteId, propertyId])
+  @@index([noteId])
+  @@index([propertyId])
+}
+
 model FlashcardDeck {
   id         String      @id @default(cuid())
   userId     String