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/Program.cs

@@ -1,6 +1,9 @@
 using Microsoft.AspNetCore.HttpOverrides;
 using Microsoft.Extensions.Options;
 
+using MongoDB.Bson;
+using MongoDB.Bson.Serialization;
+using MongoDB.Bson.Serialization.Serializers;
 using MongoDB.Driver;
 using MongoDB.Entities;
 
@@ -10,7 +13,6 @@ using PrivaPub.Data;
 using PrivaPub.Extensions;
 using PrivaPub.Middleware;
 using PrivaPub.Models;
-using PrivaPub.Models.Data;
 using PrivaPub.Services;
 using PrivaPub.StaticServices;
 
@@ -45,7 +47,7 @@ try
 			.PrivaPubOptimizationConfiguration()
 			.PrivaPubDataBaseConfiguration()
 			.PrivaPubServicesConfiguration()
-			.PrivaPubHTTPSignature(builder.Configuration)
+			.PrivaPubFederationConfiguration()
 			.PrivaPubCORSConfiguration()
 			.PrivaPubMiddlewareConfiguration();
 	}
@@ -57,11 +59,9 @@ try
 
 	try
 	{
+		BsonSerializer.RegisterSerializer(new GuidSerializer(GuidRepresentation.Standard));
 		var mongoSettings = builder.Configuration.GetSection(nameof(MongoSettings)).Get<MongoSettings>();
 		await DB.InitAsync(mongoSettings.Database, MongoClientSettings.FromConnectionString(mongoSettings.ConnectionString));
-		var logsConnectionString = builder.Configuration.GetLogsConnectionString();
-		await DB.InitAsync(mongoSettings.LogsDatabase, MongoClientSettings.FromConnectionString(logsConnectionString));
-		DB.DatabaseFor<PrivaPub>(mongoSettings.LogsDatabase);
 	}
 	catch (Exception ex)
 	{
@@ -91,11 +91,9 @@ try
 				ForwardedHeaders = ForwardedHeaders.XForwardedFor | ForwardedHeaders.XForwardedProto
 			});
 		}
-		else if(app.Environment.IsDevelopment())
-		{
-			app.UseSwagger();
-			app.UseSwaggerUI();
-		}
+
+		app.UseSwagger();
+		app.UseSwaggerUI();
 
 		app.UseHttpsRedirection();
 		app.UseCors("DefaultCORS");
@@ -112,6 +110,12 @@ try
 		//		context.Request.Path.StartsWithSegments("/users"),
 		//		app => app.UseSignatureVerification().UseDigestVerification());
 
+		app.MapGet("/build.json", () => Results.Json(new
+		{
+			commit = BuildInfo.Commit,
+			buildRef = BuildInfo.Ref,
+			builtAt = BuildInfo.BuiltAt,
+		}));
 		app.MapControllers();
 		//app.MapFallbackToFile("index.html");
 	}
@@ -138,5 +142,6 @@ try
 catch (Exception ex)
 {
 	Log.ForContext<Program>().Fatal(ex, $"{nameof(Program)}.{nameof(Program)}()");
+	Environment.ExitCode = 1;
 }