Funkwhale's answers, deletions and NodeInfo are understood

Three shapes Funkwhale 2.0 sends, each of which lost something:
- its Accept is named after the Follow it answers, on our origin (`…#follows/<uuid>/accept`), and was refused as off its
  actor's origin, so no follow of a channel completed: an Accept or Reject whose id extends the id of the activity it
  answers, on our origin, is now taken;
- a channel deletes its uploads in one Delete without an id, their ids in a list as the object's id: each is deleted;
- its NodeInfo discovery names the document under its swagger schema's URL: a link whose path names NodeInfo is taken
  when no rel is known.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LsXgEaXee4GCU1hwYgPJXw

PrivaPub.Tests/Statistics/DescribeTests.cs

@@ -59,6 +59,10 @@ namespace PrivaPub.Tests.Statistics
 
 			Assert.Equal(("https://a.example/2.2", "2.2"), InstanceDocuments.NodeInfoLink(links));
 			Assert.Equal(default, InstanceDocuments.NodeInfoLink(Json("[]")));
+			// Funkwhale 2.0 links its NodeInfo under its swagger schema's URL
+			Assert.Equal(("https://f.example/api/v2/instance/nodeinfo/2.1", "2.1"), InstanceDocuments.NodeInfoLink(Json("""
+				{"links":[{"rel":"https://docs.funkwhale.audio/swagger/schema.yml","href":"https://f.example/api/v2/instance/nodeinfo/2.1"}]}
+				""")));
 		}
 
 		[Fact]