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/rar_client.py

@@ -110,8 +110,10 @@ class RarClient:
     def get_finalizate(self, token: str) -> list[dict]:
         """Lista prezentarilor finalizate (pentru reconciliere — T2).
 
-        Atentie: pe mediul TEST raspunsul NU contine `prestatii` (vezi contract).
-        Portare din rar-forms.prg:720 / getAllPrezentariFinalizate.
+        GET /prezentari/getAllPrezentariFinalizate -> data.content (listă).
+        Verificat live: filtrele/paginarea NU functioneaza pe test (vezi contract),
+        deci interogam fara parametri si filtram client-side. Pe test `prestatii`
+        vine null in fiecare item — match-ul se face pe vin+dataPrestatie+odometruFinal.
         """
         resp = self._client.get(
             "/prezentari/getAllPrezentariFinalizate",
@@ -119,8 +121,14 @@ class RarClient:
         )
         if resp.status_code != 200:
             raise RarError(f"getFinalizate esuat (HTTP {resp.status_code})", status_code=resp.status_code)
-        data = _safe_json(resp)
-        return data.get("data", data) if isinstance(data, dict) else data
+        body = _safe_json(resp)
+        if isinstance(body, dict):
+            data = body.get("data")
+            if isinstance(data, dict) and isinstance(data.get("content"), list):
+                return data["content"]
+            if isinstance(data, list):
+                return data
+        return []
 
 
 def _safe_json(resp: httpx.Response) -> Any: