fix: load desk consents automatically when a turno is opened

- cargarConsentimientosDesk() called from abrirFicha using DESK_ID
- First checks existing DB records (get_consentimientos), falls back to desk config
- abrirFormularioLugar shows proper errors if no patient or no turno
- Starts polling on open to detect patient signature in real time
- Fix creado_at column error in create_consent_token INSERT

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

modules/turnero/api/create_consent_token.php

@@ -60,8 +60,8 @@ if ($existente) {
     );
 
     $stmt = $pdo->prepare(
-        "INSERT INTO turnero_consentimientos (turno_id, formulario_id, token, estado, creado_at)
-         VALUES (?, ?, ?, 'pendiente', NOW())"
+        "INSERT INTO turnero_consentimientos (turno_id, formulario_id, token, estado)
+         VALUES (?, ?, ?, 'pendiente')"
     );
     $stmt->execute([$turnoId, $formularioId, $token]);
 }