feat: register transport RPCs over LNbits nostr transport

Mirrors what aiolabs/withdraw did — hooks lnurlp's existing CRUD into
the LNbits nostr transport layer so an HTTP-allergic client (e.g.
lamassu-next ATM) can manage PayLinks over kind-21000 encrypted
events instead of HTTP.

Extends the existing `lnurlp_start()` lifecycle hook (auto-invoked
by the LNbits extension manager) to import the transport's
`register_rpc` and register five RPCs:

  lnurlp_create   AUTH_WALLET
  lnurlp_get      AUTH_WALLET
  lnurlp_list     AUTH_ACCOUNT
  lnurlp_update   AUTH_WALLET
  lnurlp_delete   AUTH_WALLET

All handlers are thin shims around the existing crud.py functions —
no business logic duplication. *_get / *_update / *_delete verify
that the link's stored wallet matches the caller's wallet id.

Also registers a link-owner resolver with the core subscriptions
module (tag "lnurlp", extras-key "link" — the default, matching
where views_lnurl.py:86 stamps the link id on settlement). That lets
clients call `subscribe_payments({tag:"lnurlp", link_id:...})` and
stream real-time pay events without polling, with ownership enforced
server-side.

The transport import is guarded by try/except ImportError so this
extension still loads cleanly against an LNbits build that doesn't
have nostr_transport.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

__init__.py

@@ -42,6 +42,42 @@ def lnurlp_start():
     task = create_permanent_unique_task("lnurlp", wait_for_paid_invoices)
     scheduled_tasks.append(task)
 
+    # Expose lnurlp's CRUD over the LNbits nostr transport so an HTTP-
+    # allergic client (e.g. lamassu-next ATM) can manage PayLinks over
+    # kind-21000 encrypted events. Also wires the link-owner resolver so
+    # `subscribe_payments({tag:"lnurlp", link_id:...})` can verify
+    # ownership of the underlying wallet. No-op if the core transport
+    # module isn't present in the LNbits build.
+    try:
+        from lnbits.core.services.nostr_transport.dispatcher import (
+            AUTH_ACCOUNT,
+            AUTH_WALLET,
+            register_rpc,
+        )
+        from lnbits.core.services.nostr_transport.subscriptions import (
+            register_link_owner_resolver,
+        )
+    except ImportError:
+        return
+
+    from .transport_rpcs import (
+        handle_lnurlp_create,
+        handle_lnurlp_delete,
+        handle_lnurlp_get,
+        handle_lnurlp_list,
+        handle_lnurlp_update,
+        resolve_lnurlp_owner,
+    )
+
+    register_rpc("lnurlp_create", handle_lnurlp_create, AUTH_WALLET)
+    register_rpc("lnurlp_get", handle_lnurlp_get, AUTH_WALLET)
+    register_rpc("lnurlp_list", handle_lnurlp_list, AUTH_ACCOUNT)
+    register_rpc("lnurlp_update", handle_lnurlp_update, AUTH_WALLET)
+    register_rpc("lnurlp_delete", handle_lnurlp_delete, AUTH_WALLET)
+    # lnurlp stamps `extra["link"] = link.id` on settlement
+    # (views_lnurl.py:86), which is the default extras-key, so no override.
+    register_link_owner_resolver("lnurlp", resolve_lnurlp_owner)
+
 
 __all__ = [
     "db",