Replace the ``tax_receipt_in_portal.report_uuid`` system parameter by a
per-company setting, in Settings > Invoicing > Tax Receipts
(``res.company.tax_receipt_report_id``). Each receipt is rendered with
the report of its issuing company, not the current one: in the portal,
the current company is the website's. The selector only offers PDF Form
reports on ``l10n.fr.tax.receipt``; type and model are still checked at
rendering time since the report can be edited after selection.
The download buttons of the list and detail pages are only shown when
the PDF can actually be rendered: a valid report is configured for the
issuing company and no mapped field resolves to an empty value. The
checks are those of the rendering itself, exposed as a filter
(``_get_pdf_available_receipts``) and run in sudo to avoid false
negatives on field paths the donor cannot read. Otherwise a discreet
"PDF available soon" mention replaces the button, and the download URL
redirects to the receipt page.
The detail page download link now also carries the share token, so a
visitor reaching the page by token can download the PDF.
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