fix: ventas page uses same SQL as automation (FACTURA_DIAN + FECHAFACT)

- Hardcode _SQL_VENTAS and _SQL_VENTAS_BY_FACTURA matching automation.py
- Remove stored query selector from UI — ventas always queries CMXC by billing date
- send-one now fetches factura directly by PREFIJO+NUM_FACTURA (no date range requery)
- Remove query_id dependency from all endpoints and JS formParams

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/templates/ventas.html

@@ -11,18 +11,9 @@
                 <h3 class="font-semibold text-gray-800"><i class="fas fa-cog mr-2 text-emerald-500"></i>Parámetros</h3>
             </div>
             <div class="p-5 space-y-4">
-                <div>
-                    <label class="block text-xs font-medium text-gray-600 mb-1">Consulta SQL</label>
-                    <select id="f-query" class="w-full px-3 py-2 border border-gray-300 rounded-lg text-sm">
-                        <option value="">Seleccionar consulta...</option>
-                        {% for q in queries %}
-                        <option value="{{ q.id }}">{{ q.name }}</option>
-                        {% endfor %}
-                    </select>
-                </div>
                 <div>
                     <label class="block text-xs font-medium text-gray-600 mb-1">Factura <span class="text-gray-400">(opcional)</span></label>
-                    <input id="f-factura" type="text" placeholder="Ej: LHXC03404"
+                    <input id="f-factura" type="text" placeholder="Ej: CMXC309"
                         class="w-full px-3 py-2 border border-gray-300 rounded-lg text-sm">
                 </div>
                 <div class="grid grid-cols-2 gap-3">
@@ -126,7 +117,6 @@ let formParams = {};
 
 function getParams() {
     return {
-        query_id: document.getElementById('f-query').value,
         factura: document.getElementById('f-factura').value,
         fecha_inicio: document.getElementById('f-fi').value,
         fecha_fin: document.getElementById('f-ff').value,
@@ -135,7 +125,6 @@ function getParams() {
 
 async function cargarRegistros() {
     formParams = getParams();
-    if (!formParams.query_id) { showToast('Selecciona una consulta SQL', 'warning'); return; }
     if (!formParams.fecha_inicio || !formParams.fecha_fin) { showToast('Ingresa las fechas', 'warning'); return; }
 
     document.getElementById('tabla-wrap').innerHTML = `