R2 accounts are safe: email by password and code, recovery only to it, sessions that end

Completion program R2 (docs/ROADMAP.md, 2026-10-17).

- An email address is set only with the password and a 6-digit code sent to it: /clientapi/user/email, /email/verify,
  /email/remove and GET /clientapi/user/account (EmailVerification: an hour, five tries, the code's hash only;
  EmailVerificationJob through the new IMailer). The request answers one sentence whether or not the address is free,
  and nothing goes to an address another login verified. The old POST /clientapi/user/update, which changed the
  address with neither and said when one was taken, answers 422.
- Recovery writes only to a verified address; migration _019 keeps the addresses given before verification existed.
- A changed password ends every session and every persona token, and answers a new JWT for the device that changed it.
- Sessions: every JWT carries its session's id ("si", kept by sniff/again). GET /clientapi/user/logout, which did
  nothing, ends that session alone (RootUser.EndedSessions, until its tokens would expire); POST
  /clientapi/user/logout/everywhere ends them all.
- AppConfiguration:HashingOptions was never bound, so passwords were hashed at the default 9789 iterations: it is
  bound now, at 210,000, and a hash made at other iterations is made again at the next sign-in (matched on the old
  hash, so two sign-ins never undo each other).
- Recovery and verification codes expire through TTL indexes; EmailVerification is never in a backup.
- AppConfigurationService reads appsettings as they are now, not the copy older builds saved in Mongo on first boot.
- ViewUserSettings and RootUserSettings carry SavedAt, so a client signing in keeps its own theme until one saved.
- Pasture: peers/mailpit.sh (Mailpit 1.31.4 as mailpit.test) receives PrivaPub's mail; recovery links open
  https://decepub.test. scenarios/accounts.sh, in sweep batch A, checks all of the above (28 checks).

Verified: dotnet build PrivaPub.sln -c Release; the pasture with gts and mailpit: accounts 28/28 and gts, 91 passed,
0 failed.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WpVCoDeM1qUTRp4fXQdfof

PrivaPub/Services/AppConfigurationService.cs

@@ -1,36 +1,19 @@
 using Microsoft.Extensions.Options;
 
-using MongoDB.Entities;
-
 using PrivaPub.Models;
-using PrivaPub.StaticServices;
 
 namespace PrivaPub.Services
 {
+	// The configuration as appsettings has it now. Builds before 2026-10-17 copied it into Mongo on first boot and read that
+	// copy forever after, so a changed SMTP account or language list never took; the copy is no longer read.
 	public class AppConfigurationService
 	{
-		public AppConfiguration AppConfiguration;
-		readonly DbEntities _dbEntities;
-		AppConfiguration _appConfigurationFromFile;
-		public AppConfigurationService(DbEntities dbEntities, IOptionsMonitor<AppConfiguration> appConfiguration)
-		{
-			_dbEntities = dbEntities;
-			_appConfigurationFromFile = appConfiguration.CurrentValue;
-		}
+		readonly IOptionsMonitor<AppConfiguration> _appConfiguration;
 
-		public async Task Init()
-		{
-			var dbAppConfiguration = await _dbEntities.AppConfiguration.ExecuteFirstAsync();
-			if (dbAppConfiguration != default)
-			{
-				if (AppConfiguration == default || AppConfiguration.LastUpdateDate != dbAppConfiguration.LastUpdateDate)
-					AppConfiguration = dbAppConfiguration;
-				return;
-			}
+		public AppConfigurationService(IOptionsMonitor<AppConfiguration> appConfiguration) => _appConfiguration = appConfiguration;
 
-			dbAppConfiguration = _appConfigurationFromFile;
-			await DB.Default.SaveAsync(dbAppConfiguration);
-			AppConfiguration = dbAppConfiguration;
-		}
+		public AppConfiguration AppConfiguration => _appConfiguration.CurrentValue;
+
+		public Task Init() => Task.CompletedTask;
 	}
 }