Filters: made on /filters, applied by each card where it is

The persona's filters (PrivaPub's /api/v2/filters): made, given words and
whole-word rules, contexts, an action and an expiry on /filters (linked from
Settings), and deleted; posts filtered one by one can be taken out. Every
status says which filters it matches; each page tells its cards where they
are (home and lists, notifications, public feeds, the thread around the
opened post, profiles), and a card leaves its post out (hide), folds it
behind the filter's title with a way to show it anyway (warn), or blurs its
media (blur). The e2e test folds and then hides a post of the persona's own.

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

Program.cs

@@ -43,6 +43,7 @@ builder.Services.AddOptions()
 	.AddScoped<StatusService>()
 	.AddScoped<AccountService>()
 	.AddScoped<ListService>()
+	.AddScoped<FilterService>()
 	.AddScoped<PublicNoticeService>()
 	.AddScoped<MediaService>()
 	.AddScoped<GroupService>()