No admin by username, no Swagger in production, no exception text to clients

S14 and the privacy items of P0:
- signing up as "admin" no longer grants admin; `PrivaPub admin promote
  <root>` (and `demote`) does, run on the box against the configured
  database;
- Swagger is served in Development only;
- every service and controller answers "Something went wrong." where it
  used to send ex.Message, and the SMTP warnings no longer log the
  recipient's address;
- sign-up and login no longer log the IP, User-Agent and root id together;
- invitation sign-up takes the persona's own AvatarUserName (and optional
  AvatarName) instead of naming the avatar after the private login, and
  refuses a persona username equal to the login's. Invitation login uses
  the named persona, creating it if it is new;
- recovery mail comes from "PrivaPub", not collAnon's support address name.

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

PrivaPub/Program.cs

@@ -11,6 +11,7 @@ using Serilog;
 
 using PrivaPub.Data;
 using PrivaPub.Extensions;
+using PrivaPub.Infrastructure.Cli;
 using PrivaPub.Infrastructure.Http;
 using PrivaPub.Middleware;
 using PrivaPub.Models;
@@ -68,6 +69,12 @@ try
 		var mongoSettings = builder.Configuration.GetSection(nameof(MongoSettings)).Get<MongoSettings>();
 		await DB.InitAsync(mongoSettings.Database, MongoClientSettings.FromConnectionString(mongoSettings.ConnectionString));
 		await DB.Default.MigrateAsync<Program>();
+
+		if (args is ["admin", ..])
+		{
+			Environment.ExitCode = await AdminCommands.Run(args[1..]);
+			return;
+		}
 	}
 	catch (Exception ex)
 	{
@@ -98,8 +105,11 @@ try
 			});
 		}
 
-		app.UseSwagger();
-		app.UseSwaggerUI();
+		if (app.Environment.IsDevelopment())
+		{
+			app.UseSwagger();
+			app.UseSwaggerUI();
+		}
 
 		app.UseHttpsRedirection();
 		app.UseCors("DefaultCORS");