feat(workshop): add new customer from new order modal

- Added POST /pos/api/service-orders/customers endpoint for workshop.edit users.

- Added 'Nuevo cliente' modal reachable from the new service order form.

- After creation the customer is automatically selected in the order.

pos/blueprints/service_order_bp.py

@@ -3,6 +3,8 @@
 Prefix: /pos/api/service-orders
 """
 
+import json
+
 from flask import Blueprint, g, jsonify, request
 from middleware import require_auth
 from services.service_order_engine import (
@@ -374,6 +376,40 @@ def assign_mechanic_endpoint(so_id):
         conn.close()
 
 
+@service_order_bp.route('/customers', methods=['POST'])
+@require_auth('workshop.edit')
+def create_customer_for_workshop():
+    """Create a customer directly from the workshop flow."""
+    data = request.get_json() or {}
+    if not data.get('name'):
+        return jsonify({'error': 'El nombre es obligatorio'}), 400
+
+    conn = get_tenant_conn(g.tenant_id)
+    cur = conn.cursor()
+    try:
+        cur.execute("""
+            INSERT INTO customers
+                (branch_id, name, rfc, razon_social, regimen_fiscal, uso_cfdi,
+                 cp, email, phone, address, price_tier, credit_limit, max_discount_pct, vehicle_info)
+            VALUES (%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s)
+            RETURNING id
+        """, (
+            data.get('branch_id', g.branch_id), data['name'], data.get('rfc'),
+            data.get('razon_social'), data.get('regimen_fiscal'), data.get('uso_cfdi', 'G03'),
+            data.get('cp'), data.get('email'), data.get('phone'), data.get('address'),
+            data.get('price_tier', 1), data.get('credit_limit', 0), data.get('max_discount_pct', 0),
+            json.dumps(data['vehicle_info']) if data.get('vehicle_info') else None
+        ))
+        customer_id = cur.fetchone()[0]
+        conn.commit()
+        cur.close(); conn.close()
+        return jsonify({'id': customer_id, 'message': 'Cliente creado'}), 201
+    except Exception as e:
+        conn.rollback()
+        cur.close(); conn.close()
+        return jsonify({'error': str(e)}), 500
+
+
 @service_order_bp.route('/vehicles', methods=['POST'])
 @require_auth('workshop.edit')
 def create_vehicle_for_workshop():