A located post's author deletes it

A located post's card had no action at all, so whoever wrote one (with this device's position) could not take it back
from the app. The persona's own located card now has Delete, which asks first, without the line about other servers
(a located post never left PrivaPub), and goes through /clientapi/post/delete, since the Mastodon API looks past
located posts. The globe's end-to-end test deletes the post it writes this way.

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

Models/APIs.cs

@@ -33,6 +33,7 @@ public static class APIs
 		public const string GET_Posts = "clientapi/post/list";
 		public const string GET_Nearby = "clientapi/post/nearby";
 		public const string POST_InsertPost = "clientapi/post/insert";
+		public const string POST_DeletePost = "clientapi/post/delete";
 		public const string GET_ModeratorReports = "clientapi/moderator/reports";
 		public static string POST_M_ResolveReport(string reportId) => $"clientapi/moderator/reports/{Uri.EscapeDataString(reportId)}/resolve";
 		public const string GET_AdminDomainBlocks = "clientapi/admin/domainblocks/list";