R3 two-factor in decePub: an authenticator app set up in Settings, its code asked for at sign-in

Completion program R3, with PrivaPub's TOTP routes of the same release.

- Settings, the login: TotpEditor turns two-factor sign-in on (the password, then the QR code, the secret and the
  otpauth:// link, then the app's first code; the ten recovery codes shown once with Copy), shows how many recovery
  codes are left (warned at three), and turns it off with the password and a code, asked first.
- Turning it on, like a password change, ends every other session: AuthService.ContinueSession takes the new JWT and
  exchanges the persona's token again.
- Sign-in: PrivaPub's 428 keeps the name and password and asks for the six digits (DOtp), or a recovery code instead;
  a wrong code says so; Back returns to the password.
- window.copyText (main.js) through AppStatusService.CopyText.
- 29 keys in both resx files; CLAUDE.md follows.

Verified: dotnet build decePubClient.csproj -c Release (0 errors, no new warnings).

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

ClientJsonContext.cs

@@ -41,6 +41,10 @@ namespace decePubClient;
 [JsonSerializable(typeof(EmailChangeForm))]
 [JsonSerializable(typeof(EmailCodeForm))]
 [JsonSerializable(typeof(PasswordForm))]
+[JsonSerializable(typeof(TotpCodeForm))]
+[JsonSerializable(typeof(TotpDisableForm))]
+[JsonSerializable(typeof(ViewTotpSetup))]
+[JsonSerializable(typeof(ViewTotpEnabled))]
 [JsonSerializable(typeof(ViewUserSettings))]
 // recover/valid takes the code as a JSON string ([FromBody] string) and answers a JSON bool
 [JsonSerializable(typeof(string))]