feat(customers): show razon_social, address, cp in customer views

- Add address and cp to list_customers() backend response
- Show razon_social as subtitle in customer table rows
- Add razon_social and cp fields to detail panel
- Update customers.html detail panel layout

pos/templates/customers.html

@@ -384,10 +384,18 @@
             <div class="detail-section">
               <div class="detail-section__title">Información de Contacto</div>
               <div class="info-grid">
+                <div class="info-row info-row--full">
+                  <span class="info-label">Razón Social</span>
+                  <span class="info-value" id="detailRazonSocial">—</span>
+                </div>
                 <div class="info-row info-row--full">
                   <span class="info-label">Dirección</span>
                   <span class="info-value" id="detailAddress">Av. Insurgentes Sur 1602, Col. Crédito Constructor, CDMX</span>
                 </div>
+                <div class="info-row">
+                  <span class="info-label">CP</span>
+                  <span class="info-value info-value--mono" id="detailCp">—</span>
+                </div>
                 <div class="info-row">
                   <span class="info-label">Teléfono</span>
                   <span class="info-value info-value--mono" id="detailPhone">+52 55 1234-5678</span>