- Add autoconfig XML endpoint on autoconfig.lassul.us via nginx
- Add DNS SRV records for IMAPS and SMTP submission (RFC 6186)
- Fix vmail tmpfiles rules to use 2770 to match dovecot pre-start

mutt:
- Fix notmuch folder queries to use Maildir++ dot prefix
- INBOX opens by default via explicit notmuch spoolfile
- Unread shows all unread across all folders
- Archive (A) tags messages, hidden from INBOX on sync
- Show mailbox counts in sidebar at startup
- Set mbox_type=Maildir, auto-confirm append/create/delete

muchsync:
- Move archived messages from INBOX to archive folder before sync

Enable mail_check_stats so sidebar shows counts without opening
each mailbox first. Change archive (A) to move messages to an
archive folder on disk instead of just tagging.

notmuch indexes Maildir++ folders with the dot prefix, so queries
need folder:.to.steam not folder:to.steam. INBOX is the root
maildir, queried as folder:"".

Use tmpfiles z/Z rules to set group permissions on /var/vmail
so the virtualMail group (which lass is in) can access mail
directories for muchsync/notmuch.

Symlink ~lass/Maildir to vmail, add lass to virtualMail group,
install notmuch + muchsync for remote sync.

- notmuch: remove hardcoded mailboxes, use folder: queries instead of tags
- mutt: auto-discover sieve folders from Maildir at startup
- muchsync: connect to neoprism.lassul.us:45621 instead of green