maybe laxer match on authority - fixes #815

What does this PR do?

In all the places I could easily find, that compare hostnames, I made them compare authority/domain as indicated by the Public Suffix List.

Essentially: since (for example) thenautilus.net is one level below a public suffix (net), everything under thenautilus.net is under the control of the same "entity" (me, in this case), and all such hosts can be considered "equivalent" as an origin.

Not really tested, I just spun up a local test instance and fetched @bsky.brid.gy@bsky.brid.gy which has some collections on differnt hostnames, and it got accepted.

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