changement vers google drive storage pour les contrats.

Tentative d'obtenir un token de connection échoue

docs/database-restore.md

@@ -15,6 +15,7 @@ incident.
 |---|---|---|
 | `db_backup_<timestamp>.dump` | Full PostgreSQL dump, custom format | Every account, tryout, evaluation, note and contract record |
 | `documents_backup_<timestamp>.zip` | `documents/` directory | The contract **files** themselves — they exist only on disk, the database stores paths |
+| `documents_backup_drive_<timestamp>.zip` | Google Drive contract folder | Drive-stored contracts downloaded and archived when `DOCUMENT_STORAGE_BACKEND=google_drive` |
 
 Losing either one alone loses data. A database restore without the document
 archive leaves contract rows pointing at files that no longer exist.

docs/security-checklist.md

@@ -82,8 +82,9 @@ Run through this checklist before deploying to production.
 
 - [ ] Upload size limited to 16MB (`MAX_CONTENT_LENGTH`)
 - [ ] File extensions restricted to PDF only
+- [ ] File content validated by parsing with pypdf (`PdfReader`) — header (`%PDF-`) + at least one parseable page
 - [ ] Files stored with UUID filenames (not original names)
-- [ ] Upload directory outside web root
+- [ ] Upload directory outside web root (or Google Drive in production)
 
 ## Phase 13 — Logging & Monitoring