feat(web): self-onboarding multi-tenant + auth sesiune (PRD 3.3a)

Canalul web trece de la 100% deschis (hardcodat cont 1) la autentificat si
multi-tenant. Un service nou se inregistreaza din browser, primeste o cheie API
(o singura data) si o sesiune; contul se creeaza "in asteptare" (active=0) si nu
trimite la RAR pana la activarea de catre admin (tools/account.py activate).

- users + app/users.py: parole scrypt (salt per-user, eticheta parametri onorata
  la verify pentru migrare cost), email unic case-insensitive
- sesiune: SessionMiddleware (same_site=strict, https_only config) + app/web/session.py
  (current_account/web_account/require_login->LoginRequired, set_session clear-inainte)
- CSRF (app/web/csrf.py) enforce in prod inclusiv pe login/signup + rate-limit
  in-proces (app/web/ratelimit.py) pe signup si login
- signup/login/logout (app/web/auth_routes.py): signup tranzactie atomica,
  cheie-o-data, log SIGNUP pentru descoperire admin
- dashboard + import scoped pe contul sesiunii (regula NULL->cont 1); toate rutele
  web care ating date sensibile sub require_login; nomenclator ramane global
- banner "cont in asteptare" pentru conturi active=0
- gate worker: claim_one LEFT JOIN accounts COALESCE(active,1)=1 (account_id NULL=activ)

VERIFY context curat (2 runde): leak cross-account /_fragments/mapari prins+reparat.
/code-review high: csrf_token lipsa pe re-randari de eroare, scrypt_params ignorat,
login fara rate-limit -- toate reparate. 361 teste pass (de la 313).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docs/ROADMAP.md

@@ -48,7 +48,7 @@ Reguli de contract (detalii in `docs/api-rar-contract.md`): `FINALIZATA` e termi
 > PRD-uri (`docs/prd/prd-X.Y-*.md`), linkate in coloana Detalii. La fiecare livrabila terminata:
 > schimba statusul + data + linkul PRD si actualizeaza "Ultima actualizare".
 
-**Ultima actualizare**: 2026-06-17 — 3.2 LIVRAT (scope pe cont la toate GET-urile API `/v1/*` care ating `submissions`/`operations_mapping`: `account_scope_clause` cu regula NULL→cont 1, 404 cross-account byte-identic, allowlist campuri pe detaliu, index `(account_id,status)`, regula B8 in contract; nomenclator ramane global. 14 teste noi, 313 pass. VERIFY=PASS context curat). Urmeaza 3.3 (self-onboarding web). Deferat din 3.1 (P3): `rename`/`set-cui`, `--if-not-exists`; `set-password --account N` in 3.3 cu `app/users.py`.
+**Ultima actualizare**: 2026-06-17 — 3.3a LIVRAT (self-onboarding web core: `app/users.py` parole scrypt cu eticheta de parametri onorata la verify; `SessionMiddleware` same_site=strict + `app/web/session.py` guard `require_login`→`LoginRequired`; CSRF per-sesiune enforce in prod inclusiv pe login/signup + rate-limit signup & login in-proces; signup `active=0` tranzactie atomica + cheie-o-data + log `SIGNUP`; login/logout; dashboard & import multi-tenant scoped pe sesiune cu regula NULL→cont 1 — toate rutele web care ating date sensibile sub `require_login` + scope; gate worker `claim_one` `LEFT JOIN ... COALESCE(active,1)=1`. 2 runde VERIFY context curat — runda 1 a prins un leak cross-account pe `/_fragments/mapari`, reparat; runda 2 PASS. `/code-review` high a prins 3 findings, reparate. 361 teste pass). Urmeaza 3.3b (self-service cheie/creds + admin web + email). Deferat din 3.1 (P3): `rename`/`set-cui`, `--if-not-exists`.
 
 ### Etapa 1 — Canal API ROAAUTO (Treapta 1)
 
@@ -74,7 +74,8 @@ Reguli de contract (detalii in `docs/api-rar-contract.md`): `FINALIZATA` e termi
 |---|-----------|--------|------|---------|
 | 3.1 | Creare cont nou (CLI dedicat) | DONE | 2026-06-17 | CLI `tools/account.py` (create/list[--pending]/activate/deactivate, `--with-key` atomic) + `accounts.active` + index unic CUI + `app/accounts.py`. 20 teste noi. PRD: [prd-3.1](prd/prd-3.1-creare-cont.md) |
 | 3.2 | Filtrare pe cont a GET-urilor de listare | DONE | 2026-06-17 | scope cheie pe `/v1/prezentari(/{id})`, `/v1/mapari(/pending)`, `/v1/audit/export` (NULL→cont 1); nomenclator global; 404 cross-account identic (B3) + allowlist campuri detaliu (B4) + helper `account_scope_clause` (B2) + index (B5). 14 teste noi, 313 pass. PRD: [prd-3.2](prd/prd-3.2-filtrare-cont-get.md) |
-| 3.3 | Self-onboarding web + interfata admin | TODO (PRD aprobat) | | signup/login/sesiuni + cont "in asteptare" + gate worker + CSRF + panou admin web + email. 12 stories. PRD: [prd-3.3](prd/prd-3.3-self-onboarding-web.md) |
+| 3.3a | Self-onboarding web (core) | DONE | 2026-06-17 | `users` (scrypt) + sesiune (`SessionMiddleware`, same_site=strict) + CSRF (enforce prod, inclusiv login/signup) + rate-limit signup/login + signup/login/logout + dashboard & import scoped pe sesiune (NULL→1, anti-leak C6) + gate worker `active=0` (`COALESCE`). 2 runde VERIFY (leak `/_fragments/mapari` prins+reparat) + code-review (csrf erori, scrypt_params, login rate-limit). 361 teste. PRD: [prd-3.3](prd/prd-3.3-self-onboarding-web.md) |
+| 3.3b | Self-service cheie/creds + admin web + email | TODO (PRD aprobat) | | US-007 (rotire cheie + creds RAR pe ruta web), US-010 rol admin (primul cont=admin), US-011 panou `/admin` activare, US-012 email signup (degradat: log+`/admin`+`list --pending`, SMTP follow-up). PRD: [prd-3.3](prd/prd-3.3-self-onboarding-web.md) |
 
 ### Etapa 4 — Viitor (Treapta 3)