fix: replace raw ai_consent_required code with translatable message and consent prompt

- Centralize AI consent 403 responses in server-consent helpers
- Return human-readable message + code + i18n errorKey from all AI APIs
- Update dashboard and AI clients to detect code/errorKey and translate
- Add consent.ai.requiredToast i18n keys (fr/en)

memento-note/components/note-editor/publish-dialog.tsx

@@ -46,7 +46,7 @@ export function PublishDialog({ open, onClose, noteId, noteTitle, isPublic: init
           duration: 6000,
         })
       } else {
-        toast.error(data.error || 'Erreur')
+        toast.error(data.errorKey ? t(data.errorKey) : (data.error || 'Erreur'))
       }
     } catch { toast.error('Erreur') }
     finally { setLoading(false) }