feat(T2): reconciliere anti-duplicat + retry/backoff + recuperare orfane

Inchide bucla de trimitere (plan.md sect. 4 worker, failure registry).

- app/reconcile.py: match_finalizata pe vin+dataPrestatie+odometruFinal (int),
  alege id maxim la duplicate (RAR accepta duplicate, confirmat live)
- app/rar_client.get_finalizate: parseaza data.content (descoperit live ca
  ruta = GET /prezentari/getAllPrezentariFinalizate; filtrele nu merg pe test)
- app/worker rescris:
  - recuperare orfane (rand 'sending' peste lease = worker mort mid-POST)
  - pe eroare tranzitorie/timeout: reconciliere INAINTE de re-send (anti-duplicat);
    daca recordul exista la RAR -> sent fara re-POST
  - retry/backoff exponential; peste worker_max_retries -> error + banner
  - re-login la token expirat (JWT 30h)
- schema: coloana next_attempt_at (backoff) + migrare aditiva in init_db
- config: worker_sending_lease_s, worker_retry_base_s/max_s, worker_max_retries
- contract: documentata ruta+forma getAllPrezentariFinalizate (verificat live)

Verify: pytest 54 passed (15 noi T2) + validare live (reconciliere record 68514).

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

app/config.py

@@ -41,6 +41,11 @@ class Settings(BaseSettings):
     # Dev: foloseste creds <test> din settings.xml pt login worker. In productie
     # creds vin per-cerere de la ROAAUTO (T2) — lasa False.
     worker_use_test_creds: bool = False
+    # T2 — recuperare orfane + retry/backoff:
+    worker_sending_lease_s: int = 120     # rand 'sending' mai vechi de atat = orfan (worker mort mid-POST)
+    worker_retry_base_s: int = 5          # backoff = base * 2^retry (plafonat la max)
+    worker_retry_max_s: int = 300
+    worker_max_retries: int = 8           # peste atat -> error + banner (pana persistenta)
 
     @property
     def rar_base_url(self) -> str: