fix(invoicing): wire emisor config save/load and align fiscal config keys

pos/static/js/invoicing.js

@@ -62,7 +62,10 @@ const Invoicing = (() => {
         if (name === 'notas') loadNotas();
         if (name === 'complementos') loadComplementos();
         if (name === 'cancelaciones') loadCancelaciones();
-        if (name === 'config') loadFacturapiStatus();
+        if (name === 'config') {
+            loadFacturapiStatus();
+            loadEmisorData();
+        }
     }
 
     // ---- Badge helpers ----
@@ -377,6 +380,70 @@ const Invoicing = (() => {
         }
     }
 
+    // ---- Emisor data (config tab) ----
+    async function loadEmisorData() {
+        const rfcEl = document.getElementById('rfc-emisor');
+        const cpEl = document.getElementById('cp-fiscal');
+        const razonEl = document.getElementById('razon-social');
+        const regimenEl = document.getElementById('regimen-fiscal');
+        if (!rfcEl || !cpEl || !razonEl || !regimenEl) return;
+
+        try {
+            const res = await fetch('/pos/api/config/business', { headers: headers() });
+            if (!res.ok) throw new Error('Error al cargar datos fiscales');
+            const data = await res.json();
+            rfcEl.value = data.rfc || '';
+            cpEl.value = data.cp || '';
+            razonEl.value = data.razon_social || '';
+            const regimen = data.regimen_fiscal || '601';
+            regimenEl.value = regimen + ' — ' + (regimenEl.querySelector('option[value^="' + regimen + '"')?.textContent.split('—')[1]?.trim() || '');
+            // If exact value not matched, leave first option selected by SAT code prefix
+            if (!regimenEl.value.startsWith(regimen)) {
+                Array.from(regimenEl.options).forEach(function(opt) {
+                    if (opt.value.startsWith(regimen)) opt.selected = true;
+                });
+            }
+        } catch (e) {
+            console.error('Invoicing.loadEmisorData:', e);
+        }
+    }
+
+    async function saveEmisorData() {
+        const rfc = (document.getElementById('rfc-emisor')?.value || '').trim();
+        const cp = (document.getElementById('cp-fiscal')?.value || '').trim();
+        const razon_social = (document.getElementById('razon-social')?.value || '').trim();
+        const regimenValue = document.getElementById('regimen-fiscal')?.value || '601';
+        const regimen_fiscal = regimenValue.split('—')[0].trim();
+        const statusEl = document.getElementById('emisor-save-status');
+
+        if (!rfc || !razon_social || !cp) {
+            if (statusEl) statusEl.textContent = 'RFC, Razón Social y C.P. son obligatorios';
+            return;
+        }
+
+        try {
+            const res = await fetch('/pos/api/config/business', {
+                method: 'PUT',
+                headers: headers(),
+                body: JSON.stringify({ rfc, razon_social, regimen_fiscal, cp, cfdi_regimen_fiscal: regimen_fiscal, cfdi_serie: 'A' })
+            });
+            if (!res.ok) {
+                const err = await res.json().catch(() => ({ error: res.statusText }));
+                throw new Error(err.error || 'Error al guardar');
+            }
+            if (statusEl) {
+                statusEl.textContent = 'Datos fiscales guardados';
+                statusEl.style.color = 'var(--color-success)';
+            }
+            setTimeout(() => { if (statusEl) { statusEl.textContent = ''; statusEl.style.color = ''; } }, 4000);
+        } catch (e) {
+            if (statusEl) {
+                statusEl.textContent = e.message;
+                statusEl.style.color = 'var(--color-error)';
+            }
+        }
+    }
+
     async function setupFacturapi(btn) {
         if (!btn) return;
         btn.disabled = true;
@@ -747,6 +814,7 @@ const Invoicing = (() => {
 
     return {
         switchTab, loadFacturas, loadNotas, loadComplementos, loadCancelaciones, loadFacturapiStatus,
+        loadEmisorData, saveEmisorData,
         showDetail, showCancelModal, confirmCancel, processQueue,
         showNewInvoiceModal, closeNewInvoiceModal, submitNewInvoice, notaCreditoPlaceholder,
         openGlobalInvoiceModal, previewGlobalInvoice, generateGlobalInvoice, setupFacturapi,