Access supplied products from the vendor

This module makes it easy to see, from a vendor's contact record, which products that vendor supplies.

On the contact form (the standard partner form, used for vendors), a new stat button labelled "Products Supplied" appears in the button box at the top. It shows a number: the count of supplier information lines linked to that contact. The button is hidden when the count is zero, so contacts that supply nothing stay clean.

Clicking the button opens the supplier information list filtered to that vendor, so users can see and manage the products supplied by that contact directly. The opened list is pre-filtered on the vendor and pre-fills the vendor when creating a new line from there.

The count is computed automatically from the supplier information records (product.supplierinfo) whose vendor is that contact; it is not stored, so it always reflects the current data.

The module only extends res.partner and adds one view change; it does not alter purchasing, stock or pricing logic.