feat(fls): Java's view of the e-mail programs

The Java view now reads what FILIUS 2.14 keeps for its e-mail programs:
the server's domain, switch and bean accounts with their mailboxes, and the
accounts of /mailserver/konten.txt, which Java reads at every simulation
start and which so win over the bean list; the client's three folders and
address book, and its account from /konten.txt (no bean holds it).

javaEmail.ts ports the bean setters and both file readers
(stringZuListeBenutzerkonten, EmailKonto(String)); javaString.ts Java's
trim, split and StringTokenizer; javaFileSystem.ts the file lookup, now
shared with the DNS server, with the four non-ASCII units Java's
equalsIgnoreCase also takes for an ASCII letter (measured over the BMP).

Checked against Java on the corpus (the oracle dumps the e-mail state) and
on 43 account files read by EmailServer.kontenLaden and
EmailAnwendung.laden (EmailFileCases). Found: older files keep recipients
as strings in the typed lists; a getter copy of the sender is filled and
set back; one short server line makes Java throw for the whole file; a
message with an empty text is lost on reading; a broken last client line
empties the account.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

scripts/code_language_allow.txt

@@ -32,3 +32,27 @@ packages/fls/::adresse
 packages/fls/::ziel
 packages/fls/::teilnehmer
 packages/fls/::zahl
+# Property and method names of Java FILIUS's e-mail classes (EmailKonto:
+# benutzername, passwort, nachname, vorname, smtpserver, smtpport, nachrichten;
+# Email: absender, empfaenger, betreff, neu, versendet; EmailAnwendung:
+# empfangene/gesendete/erstellte Nachrichten; EmailServer.kontenLaden), as the
+# Java oracle writes them; our types call them username, password, lastName,
+# firstName, smtpServer, smtpPort, messages, sender, to, subject, isNew,
+# isSent, received, sent and drafts.
+packages/fls/::benutzername
+packages/fls/::passwort
+packages/fls/::nachname
+packages/fls/::vorname
+packages/fls/::smtpserver
+packages/fls/::smtpport
+packages/fls/::nachrichten
+packages/fls/::absender
+packages/fls/::empfaenger
+packages/fls/::betreff
+packages/fls/::neu
+packages/fls/::versendet
+packages/fls/::empfangene
+packages/fls/::gesendete
+packages/fls/::erstellte
+packages/fls/::konten
+packages/fls/::laden