Add API routes for articulos, catalogo, config, and print

Create four route modules:
- articulos.js: global article search across conceptos/facturas
- catalogo.js: catalog CRUD with Excel import via multer
- config.js: key-value configuration get/put
- print.js: ZPL label generation and Zebra printer dispatch

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

src/routes/articulos.js

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+const { Router } = require('express');
+
+function articulosRouter(db) {
+  const router = Router();
+
+  router.get('/', (req, res) => {
+    const { q } = req.query;
+    if (!q || q.length < 2) return res.json([]);
+
+    const articulos = db.prepare(`
+      SELECT c.*, f.nombre_emisor, f.fecha, f.uuid as factura_uuid
+      FROM conceptos c
+      JOIN facturas f ON f.id = c.factura_id
+      WHERE c.descripcion LIKE ?
+         OR c.no_identificacion LIKE ?
+         OR c.intercambio LIKE ?
+      ORDER BY f.fecha DESC
+      LIMIT 200
+    `).all(`%${q}%`, `%${q}%`, `%${q}%`);
+
+    res.json(articulos);
+  });
+
+  return router;
+}
+
+module.exports = { articulosRouter };

src/routes/catalogo.js

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+const { Router } = require('express');
+const multer = require('multer');
+const path = require('path');
+const { importCatalog, searchCatalog, updateIntercambio } = require('../services/catalog-service');
+
+const upload = multer({ dest: path.join(__dirname, '../../data/uploads/') });
+
+function catalogoRouter(db) {
+  const router = Router();
+
+  router.get('/', (req, res) => {
+    const { q } = req.query;
+    if (!q) {
+      const all = db.prepare('SELECT * FROM catalogo_intercambios ORDER BY no_parte_proveedor LIMIT 500').all();
+      return res.json(all);
+    }
+    res.json(searchCatalog(db, q));
+  });
+
+  router.post('/import', upload.single('file'), (req, res) => {
+    if (!req.file) return res.status(400).json({ error: 'No file uploaded' });
+    try {
+      const result = importCatalog(db, req.file.path);
+      res.json({ success: true, imported: result.imported });
+    } catch (err) {
+      res.status(500).json({ error: err.message });
+    }
+  });
+
+  router.put('/:noParteProveedor', (req, res) => {
+    const { noParteIntercambio } = req.body;
+    updateIntercambio(db, req.params.noParteProveedor, noParteIntercambio);
+    res.json({ success: true });
+  });
+
+  router.post('/', (req, res) => {
+    const { no_parte_proveedor, no_parte_intercambio } = req.body;
+    db.prepare(
+      'INSERT OR REPLACE INTO catalogo_intercambios (no_parte_proveedor, no_parte_intercambio) VALUES (?, ?)'
+    ).run(no_parte_proveedor, no_parte_intercambio);
+    res.json({ success: true });
+  });
+
+  return router;
+}
+
+module.exports = { catalogoRouter };

src/routes/config.js

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+const { Router } = require('express');
+
+function configRouter(db) {
+  const router = Router();
+
+  router.get('/', (req, res) => {
+    const rows = db.prepare('SELECT * FROM configuracion').all();
+    const config = {};
+    for (const row of rows) {
+      config[row.clave] = row.valor;
+    }
+    res.json(config);
+  });
+
+  router.put('/', (req, res) => {
+    const update = db.prepare('INSERT OR REPLACE INTO configuracion (clave, valor) VALUES (?, ?)');
+    const transaction = db.transaction(() => {
+      for (const [clave, valor] of Object.entries(req.body)) {
+        update.run(clave, valor);
+      }
+    });
+    transaction();
+    res.json({ success: true });
+  });
+
+  return router;
+}
+
+module.exports = { configRouter };

src/routes/print.js

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+const { Router } = require('express');
+const { generateLabel } = require('../services/zpl-generator');
+const { printZpl } = require('../services/print-service');
+
+function printRouter(db) {
+  const router = Router();
+
+  router.post('/', async (req, res) => {
+    const { articles } = req.body;
+    if (!articles || !articles.length) {
+      return res.status(400).json({ error: 'No articles provided' });
+    }
+
+    const config = {};
+    const rows = db.prepare('SELECT * FROM configuracion').all();
+    for (const row of rows) config[row.clave] = row.valor;
+
+    const zebraIp = config.zebra_ip;
+    const zebraPort = parseInt(config.zebra_port || '9100', 10);
+
+    let allZpl = '';
+    for (const article of articles) {
+      allZpl += generateLabel(article, article.quantity || 1) + '\n';
+    }
+
+    try {
+      await printZpl(allZpl, zebraIp, zebraPort);
+      res.json({ success: true, labels: articles.length });
+    } catch (err) {
+      res.status(500).json({ error: err.message });
+    }
+  });
+
+  return router;
+}
+
+module.exports = { printRouter };