feat(5.19): auto-send toggle per cont + tinere manuala randuri (held)

Comutator accounts.auto_send_enabled per cont: Auto OFF (default) tine randurile
la ingestie (submissions.held=1), worker-ul (claim_one AND held=0) le sare pana la
eliberare umana (per rand/bulk/auto-release OFF->ON). Snapshot held prin chokepoint
unic held_for_account pe toate caile de ingestie (API, import, reresolve, reactivare).

- schema/migrare: coloana held + index partial idx_submissions_held; auto_send_enabled
- API: echo onest held+motiv (US-010), ruta /prezentari/{id}/trimite-acum
- web: toggle header, modal confirmare tipata, buton Trimite per rand + Trimite toate,
  banner coada tinuta imbatranita (L.142), contor "In asteptare (manual)"
- worker: expire_held (US-008, inchide gaura retentie PII), metrics held gauges
- ops: tools/carantina_held + runbook rollback (R4)

Nota review (/code-review high): re-snapshot held lipseste pe caile repune/corectie
(requeue_submission, post_corectie, bulk-fix) — de aliniat separat cu create_prezentari.

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

app/web/templates/_integrare.html

@@ -216,6 +216,52 @@
     </div>
   </div>
 
+  {# Card: De ce nu ajunge la RAR? (PRD 5.19 US-010 — onestitate canal API) #}
+  {# Un POST /v1/prezentari poate intoarce 200 dar randul sa NU plece la RAR. #}
+  <div class="card" style="margin-bottom:16px;">
+    <h3 style="margin:0 0 6px; font-size:15px;">De ce nu ajunge la RAR?</h3>
+    <p class="muted" style="font-size:12px; margin:0 0 12px;">
+      Un <code>POST /v1/prezentari</code> poate intoarce <strong>200</strong> cu
+      <code>status: "queued"</code>, dar randul sa NU plece automat la RAR. Cele trei motive:
+    </p>
+    <div class="banner warn" role="note" style="margin:0 0 12px; font-size:12.5px;">
+      <strong>Conturile noi pornesc cu Trimiterea automata OPRITA (Auto OFF).</strong>
+      Primul <code>POST</code> da 200/<code>queued</code>, dar randul e tinut
+      (<code>held=true</code>) si asteapta eliberare manuala. Verifica bifa
+      <em>„Trimite automat la RAR"</em> din dashboard.
+    </div>
+    <div class="tablewrap">
+    <table>
+      <thead><tr>
+        <th>Motiv</th>
+        <th>Ce inseamna</th>
+        <th>Cum deblochezi</th>
+      </tr></thead>
+      <tbody>
+        <tr>
+          <td><span class="pill">held</span> <span class="muted">(Auto OFF)</span></td>
+          <td>Contul are Trimiterea automata OPRITA &rarr; randul e tinut
+              (<code>held=true</code>), NU pleaca la RAR.</td>
+          <td>Elibereaza manual din dashboard (butonul <em>Trimite</em> / <em>Trimite toate</em>)
+              sau activeaza Trimiterea automata. Verifici cu
+              <code>GET /v1/prezentari/{id}</code> (<code>held=true</code>).</td>
+        </tr>
+        <tr>
+          <td><span class="pill">needs_mapping</span></td>
+          <td>Cod operatie fara mapare la un cod RAR din nomenclator.</td>
+          <td>Intra in editorul de mapare din dashboard; la salvarea maparii randul
+              se re-rezolva automat.</td>
+        </tr>
+        <tr>
+          <td><span class="pill">needs_data</span></td>
+          <td>Validare de continut esuata (VIN / data prestatie / odometru).</td>
+          <td>Corectezi datele si repui prezentarea.</td>
+        </tr>
+      </tbody>
+    </table>
+    </div>
+  </div>
+
   {# Card: Export & referinta #}
   <div class="card" style="margin-bottom:16px;">
     <h3 style="margin:0 0 12px; font-size:15px;">Export &amp; referinta</h3>