Drops the legacy compat path. `purchase::start` now calls
`state.payment_provider().await?.create_invoice(CreateInvoiceParams {
...})` instead of `state.btcpay_client().await?.create_invoice(...)`.
Provider-specific concerns (BTCPay's checkout-URL rewriting from the
internal Docker hostname to the public domain, metadata enrichment
with `orderId` / `source`) move inside the BtcpayProvider impl where
they belong; the same code path now serves any future provider
(Zaprite, etc.) without fork/copy.
URL rewriting is removed from the caller (no longer needs to know
which provider's URLs to rewrite or how). The
`crate::payment::btcpay::rewrite_to_public` function stays on the
provider impl; pubpath unchanged.
Adds `paid_purchase_creates_invoice_via_provider` integration test —
previously deferred per :42's release notes because the compat path
prevented MockPaymentProvider from substituting. Now the mock works
through the same call site as production. Verifies:
- daemon delegates invoice creation to the provider
- returned provider_invoice_id is stamped on the local invoice row
- checkout_url is what the provider returned
- no license issued at this stage (that's the webhook's job)
Test count: 22 (9 unit + 4 migration + 9 API).
Grant
e2b296ce29