**Issue**:
The displayed available quantity on the ecommerce product page is incorrect for rental products when "continue selling" is enabled.

**Steps to reproduce**:
- Create a rental product tracked in stock with a quantity of 5
- Enable "continue selling" and "show available quantity below 10"
- Go to the ecommerce page of this product
- Rent 3 units for a given period, confirm and pay
- Return to the ecommerce product page
-> Whatever the selected renting period, the displayed quantity is always 2

**Cause**:
The website displays `free_qty`:
https://github.com/odoo/enterprise/blob/41c729e22c5fd1abb690f8335e933f793be0b319/website_sale_stock_renting/static/src/xml/website_sale_stock_renting_product_availability.xml#L15

`free_qty` is computed in:
https://github.com/odoo-dev/odoo/blob/0935829ddaecd7b2b6eec9157f8f790b546d06ff/addons/website_sale_stock/models/product_template.py#L36

which leads to:
https://github.com/odoo/enterprise/blob/41c729e22c5fd1abb690f8335e933f793be0b319/website_sale_stock_renting/models/website.py#L10

and ultimately relies on:
https://github.com/odoo/odoo/blob/37bf1703c7478a3010b71cd60bbb43b3295a605b/addons/stock/models/product.py#L213

This computation does not take the selected renting period into account.

There is a period-aware computation here:
https://github.com/odoo/enterprise/blob/41c729e22c5fd1abb690f8335e933f793be0b319/website_sale_stock_renting/models/website.py#L15C17-L21C1

but it is only triggered when `product.allow_out_of_stock_order` is False (i.e. when "continue selling" is disabled).

opw-[5354163](https://www.odoo.com/web#id=5354163&view_type=form&model=project.task)

Forward-Port-Of: odoo/enterprise#103333