WP-01: tenancy, identity and capability authorization

Adds the data model for accounts, locations, teams, users, memberships
and scopes, plus roles, the 70-capability catalogue, database-backed
sessions, and the audit log.

Isolation is enforced twice, independently. A Prisma extension injects
accountId into every query, and PostgreSQL row-level security filters
underneath it, keyed on a transaction-local setting. The first alone
leaves raw queries unguarded; the second alone returns empty results
without saying why.

Integration tests prove both against a real database rather than
through the application layer, which would only prove the application
layer. They create a restricted role to do it — and that exposed a trap
worth naming: **a PostgreSQL superuser bypasses row-level security even
with FORCE**. Connecting the app as one silently disables the second
layer while every application test still passes. checkTenantIsolation
now refuses to start in production on such a database, warns in
development, and reports through /api/sante. The README explains the
role to create.

The audit log is append-only by trigger, so it resists even a
superuser: a trail that can be rewritten proves nothing. Entries
carrying an adjustment or an unlock are rejected without a
justification, and known secret-bearing fields are redacted before
writing — the log is read, exported and kept for years, so it must not
become a second unencrypted copy of what is encrypted elsewhere.

Sensitive columns use AES-256-GCM with the key held outside the
database. Sign-in verifies a dummy hash for unknown accounts so timing
does not enumerate addresses.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Cr9dkEHwbDgkWPnyGj1Rjv

vitest.config.ts

@@ -1,5 +1,7 @@
 import { fileURLToPath } from 'node:url';
 
+import 'dotenv/config';
+
 import { defineConfig } from 'vitest/config';
 
 export default defineConfig({
@@ -10,7 +12,10 @@ export default defineConfig({
   },
   test: {
     environment: 'node',
-    include: ['tests/unit/**/*.test.ts'],
+    // Les tests d'intégration parlent à une vraie base : ils se sautent
+    // d'eux-mêmes quand DATABASE_URL est absente.
+    include: ['tests/unit/**/*.test.ts', 'tests/integration/**/*.test.ts'],
+    testTimeout: 30_000,
     globals: false,
   },
 });