feat(5.20): US-004/005/006/009 ingestie+API+worker+import pe mediu RAR

US-004: rezolva_rar_env (cerere>default cont>ancora globala) + MediuIndisponibil
+ cod RAR_MEDIU_INDISPONIBIL.
US-005: camp rar_env pe POST /v1/prezentari + /valideaza (Literal), echo in
SubmissionResult/ValidareResult/GET, build_key + INSERT env-aware.
US-006: AccountSessions re-cheiat (account_id, rar_env); RarClient base_url per
env; creds din slotul env; purge + recover_orphans scoped pe env (E1/1a, 1b/E6);
claim_one propaga rar_env (1c/E8); keepalive pe ancora globala (M2).
US-009: selector mediu la import (>=2 medii), eticheta la 1, banner la 0; commit
seteaza rar_env pe submissions.

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

tests/test_worker_observ.py

@@ -63,7 +63,7 @@ class FakeRar:
 def test_login_reusit_logat(env, monkeypatch):
     conn, settings = env
     import app.worker.__main__ as w
-    monkeypatch.setattr(w, "RarClient", lambda s: FakeRar())
+    monkeypatch.setattr(w, "RarClient", lambda s, **kw: FakeRar())
     sessions = w.AccountSessions(settings)
     tok = sessions.get_token(conn, 2, {"email": "a@b.ro", "password": "secretaXY"})
     assert tok == "JWT-TEST"
@@ -80,7 +80,7 @@ def test_login_reusit_logat(env, monkeypatch):
 def test_login_401_logat_fara_parola(env, monkeypatch):
     conn, settings = env
     import app.worker.__main__ as w
-    monkeypatch.setattr(w, "RarClient", lambda s: FakeRar(login_exc=RarAuthError("401", status_code=401)))
+    monkeypatch.setattr(w, "RarClient", lambda s, **kw: FakeRar(login_exc=RarAuthError("401", status_code=401)))
     sessions = w.AccountSessions(settings)
     with pytest.raises(RarAuthError):
         sessions.get_token(conn, 3, {"email": "a@b.ro", "password": "parolaGRESITA"})