refactor(cfdi): descarga masiva de XMLs por filtros en lugar de checkboxes

- Backend: POST /cfdi/download-xmls acepta CfdiFilters, usa getXmlsByFilters con LIMIT 1000
- Frontend: eliminados checkboxes y estado selectedIds; botón Descargar XMLs usa filtros activos
- Si >1000 resultados, muestra confirm() de advertencia pero permite proceder
- Agregada documentación técnica y changelog

apps/api/src/controllers/cfdi.controller.ts

@@ -82,28 +82,33 @@ export async function downloadXmlsZip(req: Request, res: Response, next: NextFun
       return next(new AppError(400, 'Tenant no configurado'));
     }
 
-    const ids = req.body.ids as number[];
-    if (!Array.isArray(ids) || ids.length === 0) {
-      return next(new AppError(400, 'Se requiere un array de IDs'));
-    }
-    if (ids.length > 1000) {
-      return next(new AppError(400, 'Máximo 1,000 CFDIs por descarga'));
-    }
+    const filters: CfdiFilters = {
+      tipo: req.body.tipo as any,
+      tipoComprobante: req.body.tipoComprobante as any,
+      estado: req.body.estado as any,
+      fechaInicio: req.body.fechaInicio as string,
+      fechaFin: req.body.fechaFin as string,
+      rfc: req.body.rfc as string,
+      emisor: req.body.emisor as string,
+      receptor: req.body.receptor as string,
+      search: req.body.search as string,
+      contribuyenteId: req.body.contribuyenteId as string,
+    };
 
-    const cfdis = await cfdiService.getXmlsByIds(req.tenantPool, ids);
+    const cfdis = await cfdiService.getCfdiXmlsForZip(req.tenantPool, filters);
     const zip = new AdmZip();
     let added = 0;
 
     for (const cfdi of cfdis) {
       if (cfdi.xml) {
-        const filename = `${cfdi.uuid || cfdi.id}.xml`;
+        const filename = `${cfdi.uuid || 'cfdi'}.xml`;
         zip.addFile(filename, Buffer.from(cfdi.xml, 'utf8'));
         added++;
       }
     }
 
     if (added === 0) {
-      return next(new AppError(404, 'No se encontraron XMLs para los CFDIs seleccionados'));
+      return next(new AppError(404, 'No se encontraron XMLs para los filtros aplicados'));
     }
 
     const zipBuffer = zip.toBuffer();