fix: organize-notebook orphelin (sed console.log) + migration DB indexes

- organize-notebook.ts: lignes orphelines supprimées (console.log multi-ligne cassé par sed)
- Migration 20260629000000: CREATE INDEX contentUpdatedAt DESC + isPublic sur Note
- schema.prisma: commentaire SQL brut retiré (invalidait prisma)

memento-note/prisma/migrations/20260629000000_add_note_indexes/migration.sql

@@ -0,0 +1,3 @@
+-- Add indexes for performance
+CREATE INDEX IF NOT EXISTS "Note_contentUpdatedAt_idx" ON "Note" ("contentUpdatedAt" DESC);
+CREATE INDEX IF NOT EXISTS "Note_isPublic_idx" ON "Note" ("isPublic");