feat(workshop): add vehicle from service order

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

- Added 'Nuevo vehiculo' modal in edit order with plate, VIN, make, model, year, color and owner.

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

pos/blueprints/service_order_bp.py

@@ -374,6 +374,39 @@ def assign_mechanic_endpoint(so_id):
         conn.close()
 
 
+@service_order_bp.route('/vehicles', methods=['POST'])
+@require_auth('workshop.edit')
+def create_vehicle_for_workshop():
+    """Create a fleet vehicle directly from the workshop flow."""
+    data = request.get_json() or {}
+    if not data.get('plate') and not data.get('vin'):
+        return jsonify({'error': 'Se requiere placa o VIN'}), 400
+
+    conn = get_tenant_conn(g.tenant_id)
+    cur = conn.cursor()
+    try:
+        cur.execute("""
+            INSERT INTO fleet_vehicles
+                (branch_id, plate, vin, make, model, year,
+                 current_mileage, fuel_type, color, owner_name, notes)
+            VALUES (%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s)
+            RETURNING id
+        """, (
+            data.get('branch_id', g.branch_id), data.get('plate'), data.get('vin'),
+            data.get('make'), data.get('model'), data.get('year'),
+            data.get('current_mileage', 0), data.get('fuel_type', 'gasolina'),
+            data.get('color'), data.get('owner_name'), data.get('notes'),
+        ))
+        vehicle_id = cur.fetchone()[0]
+        conn.commit()
+        cur.close(); conn.close()
+        return jsonify({'id': vehicle_id, 'message': 'Vehiculo creado'}), 201
+    except Exception as e:
+        conn.rollback()
+        cur.close(); conn.close()
+        return jsonify({'error': str(e)}), 500
+
+
 @service_order_bp.route('/inventory-search', methods=['GET'])
 @require_auth('workshop.view')
 def inventory_search():