Lists: made on /lists, read as a tab of the feed

A persona's lists (PrivaPub's /api/v1/lists): made, renamed, given a
replies policy and made exclusive on /lists, filled from the accounts it
follows (accounts/search?following=true), and read as the feed's Lists tab.
A followed account's profile has a Lists menu to put it in or take it out.
ListService does the calls; the e2e tests check each step against
PrivaPub's own answer.

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

MastodonJsonContext.cs

@@ -35,6 +35,9 @@ namespace decePubClient;
 [JsonSerializable(typeof(PostStatusForm))]
 [JsonSerializable(typeof(Poll))]
 [JsonSerializable(typeof(PollVoteForm))]
+[JsonSerializable(typeof(MastodonList))]
+[JsonSerializable(typeof(List<MastodonList>))]
+[JsonSerializable(typeof(ListAccountsForm))]
 public partial class MastodonJsonContext : JsonSerializerContext
 {
 }