net10, the refactor finished, and federation that works

The tree had not compiled since its first commit: Group, DmGroup and
IGroupUsersService were referenced and never written, an IDE rename had
turned the user-settings DTO into the ViewAvatarServer enum, and the settings
were saved as an entity they no longer were.

Built now:
- Group (an ActivityPub Group actor with its own keys, members, invitation
  code and optional password) and DmGroup (a conversation), with
  /clientapi/group/{list,insert,update,join,leave,approve}.
- Posts and DMs: /clientapi/post/{list,insert,delete}, /clientapi/dm/{list,insert};
  DM recipients are local usernames or user@host handles resolved by WebFinger.
- Invitation sign-up and login against the group's invitation code, checking
  the password before any account is created.
- Federation: WebFinger, NodeInfo 2.0, actors at /peasants/{name} (Person,
  Group, and an Application instance actor) with SPKI keys, draft-cavage
  RSA-SHA256 HTTP signatures both ways, an inbox handling Follow (+Accept),
  Undo, Create, Delete and Update, an outbox, notes at /posts/{id}, and a
  persisted, retried, signed delivery queue. A post to a group is announced
  by the group to its followers (FEP-1b12).
- The unused, broken typed ActivityPub models are replaced by a renderer;
  NSign's HMAC setup, which could not federate, is gone.

Upgrade: net10.0, MongoDB.Entities 25.1 (instance DB API, Standard GUIDs),
Swashbuckle 10 / OpenApi 2, Serilog.AspNetCore 10, MailKit 4.18,
PasswordGenerator 3. The JWT keys are 64 bytes (IdentityModel 8 refuses
shorter for HS512). Production runs its own mongod on 127.0.0.1:27022, as
Sintopia's apps do, and deploys to privapub.thepra.dev from the build runner.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012CzABvBkbcFqoHdmi8b9WB

PrivaPub/Controllers/ServerToServer/UsersController.cs

@@ -1,69 +1,12 @@
-using Markdig;
-
 using Microsoft.AspNetCore.Mvc;
-using PrivaPub.ClientModels.Resources;
-using PrivaPub.Extensions;
-using PrivaPub.Models.ActivityPub;
-using PrivaPub.Models.Group;
-using PrivaPub.Services;
-
-using System.ComponentModel.DataAnnotations;
 
 namespace PrivaPub.Controllers.ServerToServer
 {
-	[ApiController,
-		Route("users"), Produces("application/ld+json; profile=\"https://www.w3.org/ns/activitystreams\"; charset=utf-8")]
+	[ApiController, Route("users")]
 	public class UsersController : ControllerBase
 	{
-		readonly IRootUsersService _rootUsersService;
-
-		public UsersController(IRootUsersService rootUsersService)
-		{
-			_rootUsersService = rootUsersService;
-		}
-
 		[HttpGet, Route("{actor}")]
-		public async Task<IActionResult> GetActor(
-			[Required(ErrorMessageResourceName = "Required",
-			ErrorMessageResourceType = typeof(FieldsNameResource))] string actor,
-			CancellationToken cancellation)
-		{
-			var getResult = await _groupUsersService.GetGroup(actor, cancellation);
-			if (!getResult.IsValid)
-				return StatusCode(getResult.StatusCode, getResult);
-
-			var actorResponse = new ActivityPubActor();
-			actorResponse.Context[1] = string.Format(actorResponse.Context[1].ToString(), HttpContext.Request.PathBase);
-			actorResponse.Id = $"{HttpContext.GetHost()}/peasants/{actor}";
-			actorResponse.ProfileURL = $"{HttpContext.GetHost()}/peasants/{actor}";
-			actorResponse.Inbox = $"{HttpContext.GetHost()}/peasants/{actor}/mouth";
-			actorResponse.Outbox = $"{HttpContext.GetHost()}/peasants/{actor}/anus";
-			actorResponse.Endpoints = new()
-			{
-				SharedInboxURL = $"{HttpContext.GetHost()}/peasants/{actor}/human-centipede",
-				OAuthAuthorizationEndpoint = $"{HttpContext.GetHost()}/sniff/again",
-			};
-			actorResponse.PreferredUsername = actor;
-			actorResponse.Name = actor;
-
-			if (getResult.Data is DmGroup dmGroup)
-			{
-				actorResponse.Summary = Markdown.ToHtml(dmGroup.Description);
-				actorResponse.Published = dmGroup.CreationDate;
-			}
-			else if (getResult.Data is Group dbGroup)
-			{
-				actorResponse.Summary = Markdown.ToHtml(dbGroup.Description);
-				actorResponse.Published = dbGroup.CreationDate;
-			}
-
-			return Ok(actorResponse);
-		}
-
-		#region Admin
-
-
-
-		#endregion
+		public IActionResult GetActor(string actor) =>
+			RedirectPermanent($"/peasants/{Uri.EscapeDataString(actor)}");
 	}
 }