feat(fls): import the e-mail programs into the editor model

The e-mail client and server of every host come into the model (core:
EmailClientConfiguration, EmailServerConfiguration, EmailMessage), from
Java's view:

- the server's accounts are those of /mailserver/konten.txt, as Java reads
  them at every simulation start; without the file those of the bean list,
  which Java would drop;
- the client's account is that of /konten.txt; without it the first of an
  older file's kontoListe, which FILIUS 2.14 no longer reads;
- messages are numbered per program in folder order, as Swift does; the
  sent folder's are sent; a date is taken only when the file gives one.

Departures from Swift: accounts and messages stay where Swift drops what
fails its checks; first and last name stay apart; a port that is no number
is the default, with a warning. On the corpus the model matches Swift's on
all 13 files; the one Swift error is named (it numbers a mailbox's messages
as their received time and writes that into the konten.txt it rewrites).

The Swift dump now carries the e-mail state, and the file system
comparison leaves out only Swift's hidden state files (and the directories
it makes for them) instead of all of /mail, /mailserver and /peer2peer.

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

packages/fls/src/systemSoftware.ts

@@ -34,6 +34,7 @@ import {
   javaContacts,
   javaEmailAccounts,
   javaEmails,
+  javaLegacyEmailAccounts,
   readEmailClientFile,
   readEmailServerFile,
   type JavaContact,
@@ -167,6 +168,8 @@ export interface FlsApplication {
   addressBook?: JavaContact[];
   /** EmailAnwendung: the account of /konten.txt, null without one. */
   fileAccount?: JavaEmailAccount | null;
+  /** EmailAnwendung: the accounts of an older file's kontoListe, which FILIUS 2.14 ignores. */
+  legacyAccounts?: JavaEmailAccount[];
   /** The application's JavaBean, for the e-mail layer. */
   source: JavaObject;
 }
@@ -325,6 +328,7 @@ function applications(map: JavaValue | undefined, root: FlsFileTree, warn: Warn)
         entry.addressBook = javaContacts(at('adressbuch'), warn);
         const file = javaFileContent(root, EMAIL_CLIENT_FILE);
         entry.fileAccount = file === undefined ? null : readEmailClientFile(file, warn);
+        entry.legacyAccounts = javaLegacyEmailAccounts(at('kontoListe'), warn);
         break;
       }
     }