Filters: words and posts a persona would rather not see

Mastodon's v2 filters replace the empty stubs: a filter's title, contexts,
action (warn, hide, blur) and expiry, its keywords (whole words or not,
taken as JSON objects, listed or numbered form fields, with id and _destroy
on update) and its statuses, each with their own endpoints; the v1 API is
the same filters seen keyword by keyword. Every status a persona reads
carries the filters it matches in `filtered` (a boost as what it boosts),
matched as Mastodon matches: warning, title, text, poll options and media
descriptions. Clients apply context and action. Filters never federate, and
go with a deleted persona.

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

PrivaPub.Tests/Http/MastodonInstanceTests.cs

@@ -79,8 +79,6 @@ namespace PrivaPub.Tests.Http
 		}
 
 		[Theory]
-		[InlineData("/api/v1/filters")]
-		[InlineData("/api/v2/filters")]
 		[InlineData("/api/v1/suggestions")]
 		[InlineData("/api/v2/suggestions")]
 		[InlineData("/api/v1/followed_tags")]