feat(portal-bff): session middleware with AES-256-GCM at rest per ADR-0010 (#110)

## Summary

Mounts `express-session` + `connect-redis` at bootstrap on top of the shared `ioredis` client, with **AES-256-GCM applied to the full JSON payload before it lands in Redis** (per ADR-0010). The configured middleware is exposed as a NestJS provider (`SESSION_MIDDLEWARE`) and `main.ts` mounts it through `app.get(...)` so it sits on the same Redis connection the rest of the BFF uses — no second client at the bootstrap layer.

Envelope is versioned (`v1.<iv>.<tag>.<ciphertext>`, all base64url) so the algorithm / key derivation can rotate without a flag-day re-encryption. Tamper / wrong-key / unknown-version all raise `SessionDecryptError`; for now the failure is logged via Pino with `event: session.decrypt_failed` — the first-class audit event lands with ADR-0013.

Scope is intentionally **infrastructure only**:
- middleware mounted on every request, `req.session` available downstream
- session id = `crypto.randomBytes(32).toString('base64url')` (256 bits per ADR-0010)
- cookie name: `__Host-portal_session` in production, `portal_session` in dev (the `__Host-` prefix mandates `Secure`, which dev HTTP can't satisfy)
- `httpOnly + sameSite=lax + path=/`; `resave:false`, `saveUninitialized:false`, `rolling:true`
- cookie `maxAge` follows `SESSION_IDLE_TIMEOUT_SECONDS` (default 1800)
- encryption-at-rest active end-to-end

Out of scope, landing in follow-ups: `/auth/callback` populating `req.session.user`, `/me`, `/auth/logout`, the absolute-timeout interceptor, and the `user_sessions:{userId}` secondary index.

## Notable shape choices (ADR-0010 amended in the same commit)

**Full-payload encryption vs. just the `tokens` field.** The first draft of ADR-0010 scoped at-rest encryption to a `tokens` sub-field. The session also carries claims (`oid`, `tid`, `preferred_username`, …) that qualify as PII under GDPR — for an APF-Handicap portal handling health-adjacent data this matters. Encrypting the envelope is strictly stronger and removes the need to classify fields one by one. The ADR text is updated to match.

**`ioredis` + adapter vs. switching the BFF to `node-redis`.** `connect-redis` v9 was rewritten for `node-redis` v4 and no longer accepts `ioredis` directly. Two reasonable paths:
1. **Adapter (chosen)** — keep the shared `ioredis` client; shim the six commands `connect-redis` actually calls (`get`, `set` with `{expiration:{type:'EX',value}}`, `expire`, `del`, `mGet`, `scanIterator`) to the node-redis shape. Smallest blast radius — RedisModule, OBO cache (ADR-0014), future pub/sub all stay on a single Redis library.
2. **Switch RedisModule to `node-redis`** — clean alignment with `connect-redis`'s expectations, but touches every Redis consumer and would itself require an ADR amendment.

The adapter is reversible: if we ever decide to standardise on `node-redis`, deleting one file removes it. Happy to switch if you'd rather take that path.

## Env vars

- `SESSION_ENCRYPTION_KEY` — **mandatory**, AES-256-GCM key (32 bytes after base64url decode). New `assertSessionEncryptionKey()` validator wired in `main.ts` alongside the other pre-flight checks.
- `SESSION_IDLE_TIMEOUT_SECONDS` — optional, default `1800`.
- `SESSION_ABSOLUTE_TIMEOUT_SECONDS` — optional, default `43200` (consumed by the absolute-timeout interceptor in a follow-up).

`.env.example` updated; the three variables are promoted from the "future vars" block to the active section.

## Test plan

- [x] `pnpm nx test portal-bff` — **99/99 pass** (was 62 before this PR; +37 new specs across the 5 new files).
- [x] `pnpm nx build portal-bff` — clean webpack build.
- [x] `pnpm nx lint portal-bff` — clean.
- [x] Prettier-clean for all PR source files.
- [ ] Local smoke test once the next PR wires `/auth/callback` → `req.session.user`; this PR has no user-visible behaviour to exercise on its own.

---------

Co-authored-by: Julien Gautier <julien.gautier@apf.asso.fr>
Reviewed-on: #110

package.json

@@ -81,6 +81,7 @@
     "@tailwindcss/postcss": "^4.2.4",
     "@types/cookie-parser": "^1.4.10",
     "@types/express": "^5.0.6",
+    "@types/express-session": "^1.19.0",
     "@types/jest": "^30.0.0",
     "@types/node": "24.12.4",
     "@typescript-eslint/utils": "^8.40.0",
@@ -146,7 +147,9 @@
     "axios": "^1.6.0",
     "class-transformer": "^0.5.1",
     "class-validator": "^0.15.1",
+    "connect-redis": "^9.0.0",
     "cookie-parser": "^1.4.7",
+    "express-session": "^1.19.0",
     "ioredis": "^5.10.1",
     "lucide-angular": "^1.0.0",
     "nestjs-cls": "^6.2.0",